Peripheral Nerve Anatomy MCQs – Answer Key<\/title>\n <style>\n @media print {\n @page {\n size: A4;\n margin: 2cm 1.5cm;\n }\n }\n \n * {\n margin: 0;\n padding: 0;\n box-sizing: border-box;\n }\n \n body {\n font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;\n font-size: 14px;\n line-height: 1.6;\n color: #000;\n background: #fff;\n padding: 15px;\n max-width: 100%;\n overflow-x: hidden;\n }\n \n @media (min-width: 768px) {\n body {\n padding: 2.5cm 2cm;\n font-size: 10.5pt;\n }\n }\n \n .header {\n text-align: center;\n margin-bottom: 20px;\n padding-bottom: 15px;\n border-bottom: 3px solid #2c3e50;\n }\n \n .header h1 {\n font-size: 20px;\n font-weight: 700;\n margin-bottom: 8px;\n color: #1a1a1a;\n }\n \n @media (min-width: 768px) {\n .header h1 {\n font-size: 18pt;\n }\n }\n \n .header h2 {\n font-size: 16px;\n font-weight: 500;\n margin-bottom: 8px;\n color: #333;\n }\n \n .header .subtitle {\n font-size: 15px;\n color: #dc3545;\n font-weight: 700;\n margin-top: 8px;\n }\n \n .section-header {\n background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);\n color: #fff;\n padding: 10px 15px;\n margin: 25px 0 15px 0;\n font-size: 15px;\n font-weight: 700;\n border-radius: 4px;\n }\n \n .answer-block {\n margin-bottom: 20px;\n padding: 15px;\n background: #f8f9fa;\n border-left: 4px solid #28a745;\n border-radius: 4px;\n page-break-inside: avoid;\n }\n \n .question-header {\n display: flex;\n justify-content: space-between;\n align-items: center;\n margin-bottom: 10px;\n flex-wrap: wrap;\n gap: 10px;\n }\n \n .question-number {\n font-weight: 700;\n font-size: 15px;\n color: #2c3e50;\n }\n \n .correct-answer {\n background: #28a745;\n color: #fff;\n padding: 4px 12px;\n border-radius: 20px;\n font-weight: 700;\n font-size: 13px;\n }\n \n .explanation {\n margin: 12px 0;\n line-height: 1.7;\n text-align: justify;\n }\n \n .explanation strong {\n color: #28a745;\n }\n \n .key-points {\n background: #fff;\n border-left: 3px solid #007bff;\n padding: 12px;\n margin-top: 10px;\n border-radius: 4px;\n }\n \n .key-points-title {\n font-weight: 700;\n color: #007bff;\n margin-bottom: 8px;\n font-size: 14px;\n }\n \n .key-points ul {\n margin-left: 20px;\n margin-top: 5px;\n }\n \n .key-points li {\n margin-bottom: 5px;\n line-height: 1.5;\n }\n \n .summary-section {\n background: #fff3cd;\n border: 2px solid #ffc107;\n padding: 15px;\n margin: 30px 0;\n border-radius: 8px;\n page-break-inside: avoid;\n }\n \n .summary-section h3 {\n color: #856404;\n font-size: 17px;\n margin-bottom: 15px;\n border-bottom: 2px solid #ffc107;\n padding-bottom: 8px;\n }\n \n .summary-section h4 {\n color: #856404;\n font-size: 15px;\n margin: 15px 0 8px 0;\n font-weight: 700;\n }\n \n .summary-section ul {\n margin-left: 20px;\n }\n \n .summary-section li {\n margin-bottom: 6px;\n line-height: 1.6;\n }\n \n .scoring-guide {\n background: #d4edda;\n border: 2px solid #28a745;\n padding: 15px;\n margin: 25px 0;\n border-radius: 8px;\n page-break-inside: avoid;\n }\n \n .scoring-guide h3 {\n color: #155724;\n font-size: 17px;\n margin-bottom: 12px;\n font-weight: 700;\n }\n \n .score-row {\n padding: 8px 0;\n border-bottom: 1px dotted #999;\n display: flex;\n justify-content: space-between;\n align-items: center;\n }\n \n .score-row:last-child {\n border-bottom: none;\n }\n \n .score-range {\n font-weight: 700;\n color: #155724;\n font-size: 14px;\n }\n \n .score-desc {\n color: #155724;\n }\n \n .page-break {\n page-break-after: always;\n margin: 40px 0;\n border-top: 2px dashed #ddd;\n padding-top: 40px;\n }\n \n @media print {\n .page-break {\n border: none;\n padding: 0;\n }\n }\n \n .footer-note {\n text-align: center;\n margin-top: 40px;\n padding-top: 20px;\n border-top: 2px solid #dee2e6;\n font-style: italic;\n color: #6c757d;\n }\n \n .website {\n text-align: center;\n font-size: 16px;\n font-weight: 700;\n color: #007bff;\n margin-top: 12px;\n }\n <\/style>\n<\/head>\n<body>\n <div class=\"header\">\n <h1>PERIPHERAL NERVE ANATOMY<\/h1>\n <h2>Clinical MCQs: Radial, Ulnar & Median Nerves<\/h2>\n <div class=\"subtitle\">ANSWER KEY WITH EXPLANATIONS<\/div>\n <\/div>\n \n <div class=\"section-header\">SECTION A: STANDARD LEVEL (Questions 1-10)<\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 1<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Radial nerve in the spiral groove.<\/strong> The classic presentation of “Saturday night palsy” occurs when the radial nerve is compressed against the humerus in the spiral groove during prolonged pressure. This causes wrist drop, finger drop, and loss of thumb extension. Sensory loss over the first dorsal web space is pathognomonic for radial nerve injury.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Wrist drop is the hallmark sign of radial nerve palsy<\/li>\n <li>First dorsal web space sensory loss distinguishes radial from other nerve injuries<\/li>\n <li>Triceps function preserved if injury is at spiral groove<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 2<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Median nerve – anterior interosseous branch.<\/strong> The anterior interosseous nerve (AIN) is a pure motor branch supplying flexor pollicis longus (FPL) and the lateral half of flexor digitorum profundus (FDP). Injury prevents flexion of the thumb IP joint and index finger DIP joint, making the “OK” sign impossible. There is no sensory loss as this is purely a motor branch.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>AIN is purely motor – no sensory deficit expected<\/li>\n <li>Classic triad: FPL, FDP to index\/middle, pronator quadratus<\/li>\n <li>Unable to make “OK” sign is diagnostic for AIN palsy<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 3<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Carpal tunnel syndrome.<\/strong> CTS involves median nerve compression at the wrist and is the most common entrapment neuropathy. Classic features include thenar atrophy, weak thumb opposition\/abduction, positive Tinel’s sign at wrist, and sensory loss over lateral 3\u00bd digits palmarly.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Most common nerve entrapment syndrome<\/li>\n <li>Positive provocative tests: Tinel’s and Phalen’s<\/li>\n <li>Thenar eminence sensation preserved (palmar cutaneous branch outside tunnel)<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 4<\/span>\n <span class=\"correct-answer\">Answer: C<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Anterior interosseous nerve.<\/strong> Supracondylar fractures can injure the AIN, which innervates flexor pollicis longus (responsible for thumb IP flexion). Unlike main median nerve injury, there is no sensory loss since AIN is purely motor.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>AIN vulnerable in supracondylar fractures<\/li>\n <li>Pure motor deficit without sensory loss<\/li>\n <li>Loss of thumb IP flexion is key finding<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 5<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Ulnar nerve at elbow.<\/strong> Ulnar nerve injury at the cubital tunnel causes clawing of ring and little fingers, weak interossei, positive Froment’s sign, and sensory loss over medial 1\u00bd fingers. This is the second most common entrapment neuropathy.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Clawing more pronounced in ring and little fingers<\/li>\n <li>Froment’s sign indicates weak adductor pollicis<\/li>\n <li>“Claw more in low lesion” – distal lesions show more clawing<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 6<\/span>\n <span class=\"correct-answer\">Answer: D<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Radial nerve.<\/strong> The radial nerve travels in the spiral groove of the mid-shaft humerus, making it the most vulnerable structure in humeral shaft fractures. Results in wrist drop, inability to extend thumb and fingers.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Radial nerve most commonly injured in humeral shaft fractures<\/li>\n <li>Runs directly in contact with bone in spiral groove<\/li>\n <li>Classic triad: wrist drop, finger drop, thumb extension loss<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 7<\/span>\n <span class=\"correct-answer\">Answer: C<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Recurrent motor branch of median nerve.<\/strong> The recurrent (thenar) motor branch has variable anatomy and arises distal to the carpal tunnel to supply thenar muscles. Can be injured during carpal tunnel release surgery, leading to permanent thenar weakness.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Variable anatomy: extraligamentous (50%), subligamentous (31%)<\/li>\n <li>Supplies: APB, opponens pollicis, superficial FPB<\/li>\n <li>Important medicolegal consideration<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 8<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Ulnar nerve.<\/strong> The ulnar nerve innervates adductor pollicis. Froment’s sign indicates adductor pollicis weakness. Preserved thumb opposition and intact thenar sensation confirm isolated ulnar nerve injury.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Froment’s sign is pathognomonic for weak adductor pollicis<\/li>\n <li>Opposition preserved because APB (median nerve) is intact<\/li>\n <li>Sensory pattern confirms isolated ulnar injury<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 9<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Index and middle fingers; median nerve.<\/strong> FDP has dual innervation: median nerve (via AIN) supplies FDP to index\/middle; ulnar nerve supplies ring\/little. Isolated median nerve injury affects DIP flexion of lateral two digits only.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>FDP: Median (index\/middle) vs Ulnar (ring\/little)<\/li>\n <li>Remember: “Median = lateral 2, Ulnar = medial 2”<\/li>\n <li>AIN supplies median portion of FDP<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 10<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Acute carpal tunnel syndrome.<\/strong> Acute CTS secondary to compartment syndrome or hematoma post-fracture. This is a surgical emergency requiring urgent decompression to prevent permanent nerve damage.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Acute CTS is a surgical emergency unlike chronic CTS<\/li>\n <li>Can occur post-trauma (fracture, crush injury)<\/li>\n <li>Requires urgent surgical decompression<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"page-break\"><\/div>\n \n <div class=\"section-header\">SECTION B: ADVANCED LEVEL (Questions 11-20)<\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 11<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Posterior interosseous nerve injury at arcade of Frohse.<\/strong> Preserved triceps indicates injury distal to spiral groove. Normal posterior forearm sensation rules out main radial nerve injury. PIN is purely motor. Arcade of Frohse is the most common site of PIN compression.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>PIN = pure motor (no sensory loss)<\/li>\n <li>Arcade of Frohse most common compression site<\/li>\n <li>Also called “radial tunnel syndrome”<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 12<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Median nerve lesion distal to pronator teres but proximal to carpal tunnel.<\/strong> FCR spared indicates lesion distal to pronator teres. Thenar involvement suggests proximal to carpal tunnel. No sensory loss because palmar cutaneous branch intact. Seen in uremic neuropathy.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>FCR spared = distal to pronator teres<\/li>\n <li>Thenar involvement = proximal to carpal tunnel<\/li>\n <li>Common in hemodialysis patients<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 13<\/span>\n <span class=\"correct-answer\">Answer: A<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Gantzer’s muscle is intact.<\/strong> Classic AIN injury affects FPL, lateral FDP, and pronator quadratus. Gantzer’s muscle (accessory FPL\/FDP head) present in 45-60% can have dual innervation. Pronation maintained by pronator teres.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Gantzer’s muscle present in 45-60%<\/li>\n <li>Can receive anomalous innervation<\/li>\n <li>Pronator teres compensates for paralyzed PQ<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 14<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Ulnar nerve at Guyon’s canal (Zone 1).<\/strong> Handlebar palsy causes ulnar compression at Guyon’s canal. ABSENCE of clawing indicates FDP preserved (distal lesion). Zone 1 affects motor and sensory. Dorsal sensation preserved.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>No clawing because FDP intact<\/li>\n <li>Zone 1 = motor + sensory involvement<\/li>\n <li>Dorsal sensation preserved<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 15<\/span>\n <span class=\"correct-answer\">Answer: C<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Marinacci communication.<\/strong> Marinacci (reverse Martin-Gruber) involves ulnar to median crossover. Proximal ulnar injury affects intrinsic hand muscles, but FDP to ring\/little preserved because fibers traveled via median nerve. Rare (1-4%) but high-yield.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Marinacci = ulnar to median crossover<\/li>\n <li>Very rare: 1-4% vs Martin-Gruber 15-20%<\/li>\n <li>Explains preserved FDP with proximal ulnar injury<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 16<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Ulnar nerve supplies FDP to index, middle, and ring fingers.<\/strong> Isolated middle finger DIP weakness with preserved index suggests anomalous innervation via Martin-Gruber anastomosis. FDP innervation shows variation in up to 30%.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>FDP innervation highly variable (up to 30%)<\/li>\n <li>Martin-Gruber can alter standard pattern<\/li>\n <li>Tests understanding of anatomical variations<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 17<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Anterior interosseous nerve syndrome.<\/strong> “Pseudo-ulnar claw” affects index\/middle (not ring\/little). FDP to index\/middle paralyzed causes lumbricals to lose tension, fingers assume claw position. Intrinsic muscles remain functional. Common in diabetes.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>“Pseudo-ulnar claw” affects index\/middle<\/li>\n <li>Mechanism: FDP paralysis \u2192 lumbrical dysfunction<\/li>\n <li>Intrinsic muscles intact<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 18<\/span>\n <span class=\"correct-answer\">Answer: E<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Posterior interosseous nerve injury.<\/strong> Preserved triceps indicates distal to axilla. Preserved brachioradialis suggests distal to spiral groove. PIN (pure motor) causes wrist\/finger drop. Sensory loss suggests complex injury pattern.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Preserved triceps = distal to proximal arm<\/li>\n <li>Preserved BR = distal to spiral groove<\/li>\n <li>PIN = pure motor<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 19<\/span>\n <span class=\"correct-answer\">Answer: C<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Isolated injury to recurrent motor branch of median nerve.<\/strong> Recurrent branch arises AFTER carpal tunnel with variable anatomy. Supplies thenar muscles. Isolated injury causes pure motor deficit without sensory loss or positive carpal tunnel tests.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Recurrent branch arises DISTAL to carpal tunnel<\/li>\n <li>Negative Tinel’s\/Phalen’s rules out CTS<\/li>\n <li>EMG shows isolated thenar denervation<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 20<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Pain with resisted forearm pronation.<\/strong> Pronator syndrome involves median nerve compression in proximal forearm. Key discriminator: pain with resisted pronation compresses nerve between PT heads. Palm sensation affected (unlike CTS). Activity-related, not nocturnal.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Pain with resisted pronation is pathognomonic<\/li>\n <li>Palm sensation affected (key differentiator from CTS)<\/li>\n <li>Activity-related symptoms, not nocturnal<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"summary-section\">\n <h3>HIGH-YIELD SUMMARY<\/h3>\n \n <h4>Anatomical Variations:<\/h4>\n <ul>\n <li><strong>Martin-Gruber (15-20%):<\/strong> Median to ulnar crossover<\/li>\n <li><strong>Marinacci (1-4%):<\/strong> Ulnar to median crossover<\/li>\n <li><strong>Gantzer’s muscle (45-60%):<\/strong> Accessory FPL\/FDP<\/li>\n <\/ul>\n \n <h4>Localization Rules:<\/h4>\n <ul>\n <li>Triceps preserved = distal to axilla<\/li>\n <li>BR preserved = distal to spiral groove<\/li>\n <li>FCR preserved = distal to pronator teres<\/li>\n <li>No sensory loss = pure motor branch<\/li>\n <\/ul>\n \n <h4>Classic Signs:<\/h4>\n <ul>\n <li><strong>Froment’s:<\/strong> Weak adductor pollicis (ulnar)<\/li>\n <li><strong>OK sign impossible:<\/strong> AIN palsy<\/li>\n <li><strong>Claw hand:<\/strong> Ulnar (ring\/little)<\/li>\n <li><strong>Pseudo-ulnar claw:<\/strong> AIN (index\/middle)<\/li>\n <\/ul>\n <\/div>\n \n <div class=\"scoring-guide\">\n <h3>SCORING GUIDE<\/h3>\n <div class=\"score-row\">\n <span class=\"score-range\">18-20 correct:<\/span>\n <span class=\"score-desc\">Excellent – Ready for exams<\/span>\n <\/div>\n <div class=\"score-row\">\n <span class=\"score-range\">15-17 correct:<\/span>\n <span class=\"score-desc\">Very Good – Review advanced concepts<\/span>\n <\/div>\n <div class=\"score-row\">\n <span class=\"score-range\">12-14 correct:<\/span>\n <span class=\"score-desc\">Good – Focus on variations<\/span>\n <\/div>\n <div class=\"score-row\">\n <span class=\"score-range\">9-11 correct:<\/span>\n <span class=\"score-desc\">Fair – Strengthen basics<\/span>\n <\/div>\n <div class=\"score-row\">\n <span class=\"score-range\">Below 9:<\/span>\n <span class=\"score-desc\">Needs significant review<\/span>\n <\/div>\n <\/div>\n \n <div class=\"footer-note\">\n For more medical MCQs and exam preparation resources\n <div class=\"website\">www.atsixty.com<\/div>\n <\/div>\n<\/body>\n<\/html>\n","protected":false},"excerpt":{"rendered":"<p>Peripheral Nerve Anatomy MCQs – Answer Key PERIPHERAL NERVE ANATOMY Clinical MCQs: Radial, Ulnar & Median Nerves ANSWER KEY WITH EXPLANATIONS SECTION A: STANDARD LEVEL (Questions 1-10) Question 1 Answer: B Radial nerve in the spiral groove. The classic presentation of “Saturday night palsy” occurs when the radial nerve is compressed against the humerus in… <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-26069","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n<title>Answers to Peripheral Nerves MCQ - atsixty<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/atsixty.com\/index.php\/2025\/12\/22\/answers-to-peripheral-nerves-mcq\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Answers to Peripheral Nerves MCQ - atsixty\" \/>\n<meta property=\"og:description\" content=\"Peripheral Nerve Anatomy MCQs – Answer Key PERIPHERAL NERVE ANATOMY Clinical MCQs: Radial, Ulnar & Median Nerves ANSWER KEY WITH EXPLANATIONS SECTION A: STANDARD LEVEL (Questions 1-10) Question 1 Answer: B Radial nerve in the spiral groove. The classic presentation of “Saturday night palsy” occurs when the radial nerve is compressed against the humerus in… \" \/>\n<meta property=\"og:url\" content=\"https:\/\/atsixty.com\/index.php\/2025\/12\/22\/answers-to-peripheral-nerves-mcq\/\" \/>\n<meta property=\"og:site_name\" content=\"atsixty\" \/>\n<meta property=\"article:published_time\" content=\"2025-12-22T17:04:44+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-12-22T18:03:39+00:00\" \/>\n<meta name=\"author\" content=\"Avi\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Avi\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/atsixty.com\\\/index.php\\\/2025\\\/12\\\/22\\\/answers-to-peripheral-nerves-mcq\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/atsixty.com\\\/index.php\\\/2025\\\/12\\\/22\\\/answers-to-peripheral-nerves-mcq\\\/\"},\"author\":{\"name\":\"Avi\",\"@id\":\"https:\\\/\\\/atsixty.com\\\/#\\\/schema\\\/person\\\/cf65e7ac7d8226d95c0bdf1036f7951d\"},\"headline\":\"Answers to Peripheral Nerves MCQ\",\"datePublished\":\"2025-12-22T17:04:44+00:00\",\"dateModified\":\"2025-12-22T18:03:39+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/atsixty.com\\\/index.php\\\/2025\\\/12\\\/22\\\/answers-to-peripheral-nerves-mcq\\\/\"},\"wordCount\":1370,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/atsixty.com\\\/#\\\/schema\\\/person\\\/cf65e7ac7d8226d95c0bdf1036f7951d\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/atsixty.com\\\/index.php\\\/2025\\\/12\\\/22\\\/answers-to-peripheral-nerves-mcq\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/atsixty.com\\\/index.php\\\/2025\\\/12\\\/22\\\/answers-to-peripheral-nerves-mcq\\\/\",\"url\":\"https:\\\/\\\/atsixty.com\\\/index.php\\\/2025\\\/12\\\/22\\\/answers-to-peripheral-nerves-mcq\\\/\",\"name\":\"Answers to Peripheral Nerves MCQ - 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The classic presentation of “Saturday night palsy” occurs when the radial nerve is compressed against the humerus in… ","og_url":"https:\/\/atsixty.com\/index.php\/2025\/12\/22\/answers-to-peripheral-nerves-mcq\/","og_site_name":"atsixty","article_published_time":"2025-12-22T17:04:44+00:00","article_modified_time":"2025-12-22T18:03:39+00:00","author":"Avi","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Avi","Est. reading time":"7 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/atsixty.com\/index.php\/2025\/12\/22\/answers-to-peripheral-nerves-mcq\/#article","isPartOf":{"@id":"https:\/\/atsixty.com\/index.php\/2025\/12\/22\/answers-to-peripheral-nerves-mcq\/"},"author":{"name":"Avi","@id":"https:\/\/atsixty.com\/#\/schema\/person\/cf65e7ac7d8226d95c0bdf1036f7951d"},"headline":"Answers to Peripheral Nerves MCQ","datePublished":"2025-12-22T17:04:44+00:00","dateModified":"2025-12-22T18:03:39+00:00","mainEntityOfPage":{"@id":"https:\/\/atsixty.com\/index.php\/2025\/12\/22\/answers-to-peripheral-nerves-mcq\/"},"wordCount":1370,"commentCount":0,"publisher":{"@id":"https:\/\/atsixty.com\/#\/schema\/person\/cf65e7ac7d8226d95c0bdf1036f7951d"},"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/atsixty.com\/index.php\/2025\/12\/22\/answers-to-peripheral-nerves-mcq\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/atsixty.com\/index.php\/2025\/12\/22\/answers-to-peripheral-nerves-mcq\/","url":"https:\/\/atsixty.com\/index.php\/2025\/12\/22\/answers-to-peripheral-nerves-mcq\/","name":"Answers to Peripheral Nerves MCQ - atsixty","isPartOf":{"@id":"https:\/\/atsixty.com\/#website"},"datePublished":"2025-12-22T17:04:44+00:00","dateModified":"2025-12-22T18:03:39+00:00","breadcrumb":{"@id":"https:\/\/atsixty.com\/index.php\/2025\/12\/22\/answers-to-peripheral-nerves-mcq\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/atsixty.com\/index.php\/2025\/12\/22\/answers-to-peripheral-nerves-mcq\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/atsixty.com\/index.php\/2025\/12\/22\/answers-to-peripheral-nerves-mcq\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/atsixty.com\/"},{"@type":"ListItem","position":2,"name":"Answers to Peripheral Nerves MCQ"}]},{"@type":"WebSite","@id":"https:\/\/atsixty.com\/#website","url":"https:\/\/atsixty.com\/","name":"At Sixty","description":"The Option Taken","publisher":{"@id":"https:\/\/atsixty.com\/#\/schema\/person\/cf65e7ac7d8226d95c0bdf1036f7951d"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/atsixty.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":["Person","Organization"],"@id":"https:\/\/atsixty.com\/#\/schema\/person\/cf65e7ac7d8226d95c0bdf1036f7951d","name":"Avi","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/atsixty.com\/wp-content\/uploads\/2025\/08\/logo-agency.png","url":"https:\/\/atsixty.com\/wp-content\/uploads\/2025\/08\/logo-agency.png","contentUrl":"https:\/\/atsixty.com\/wp-content\/uploads\/2025\/08\/logo-agency.png","width":200,"height":200,"caption":"Avi"},"logo":{"@id":"https:\/\/atsixty.com\/wp-content\/uploads\/2025\/08\/logo-agency.png"},"sameAs":["https:\/\/atsixty.com"],"url":"https:\/\/atsixty.com\/index.php\/author\/avinaux\/"}]}},"_links":{"self":[{"href":"https:\/\/atsixty.com\/index.php\/wp-json\/wp\/v2\/posts\/26069","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/atsixty.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/atsixty.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/atsixty.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/atsixty.com\/index.php\/wp-json\/wp\/v2\/comments?post=26069"}],"version-history":[{"count":3,"href":"https:\/\/atsixty.com\/index.php\/wp-json\/wp\/v2\/posts\/26069\/revisions"}],"predecessor-version":[{"id":26075,"href":"https:\/\/atsixty.com\/index.php\/wp-json\/wp\/v2\/posts\/26069\/revisions\/26075"}],"wp:attachment":[{"href":"https:\/\/atsixty.com\/index.php\/wp-json\/wp\/v2\/media?parent=26069"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/atsixty.com\/index.php\/wp-json\/wp\/v2\/categories?post=26069"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/atsixty.com\/index.php\/wp-json\/wp\/v2\/tags?post=26069"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

{"id":26069,"date":"2025-12-22T17:04:44","date_gmt":"2025-12-22T17:04:44","guid":{"rendered":"https:\/\/atsixty.com\/?p=26069"},"modified":"2025-12-22T18:03:39","modified_gmt":"2025-12-22T18:03:39","slug":"answers-to-peripheral-nerves-mcq","status":"publish","type":"post","link":"https:\/\/atsixty.com\/index.php\/2025\/12\/22\/answers-to-peripheral-nerves-mcq\/","title":{"rendered":"Answers to Peripheral Nerves MCQ"},"content":{"rendered":"\n\n\n\n \n \n Peripheral Nerve Anatomy MCQs – Answer Key<\/title>\n <style>\n @media print {\n @page {\n size: A4;\n margin: 2cm 1.5cm;\n }\n }\n \n * {\n margin: 0;\n padding: 0;\n box-sizing: border-box;\n }\n \n body {\n font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;\n font-size: 14px;\n line-height: 1.6;\n color: #000;\n background: #fff;\n padding: 15px;\n max-width: 100%;\n overflow-x: hidden;\n }\n \n @media (min-width: 768px) {\n body {\n padding: 2.5cm 2cm;\n font-size: 10.5pt;\n }\n }\n \n .header {\n text-align: center;\n margin-bottom: 20px;\n padding-bottom: 15px;\n border-bottom: 3px solid #2c3e50;\n }\n \n .header h1 {\n font-size: 20px;\n font-weight: 700;\n margin-bottom: 8px;\n color: #1a1a1a;\n }\n \n @media (min-width: 768px) {\n .header h1 {\n font-size: 18pt;\n }\n }\n \n .header h2 {\n font-size: 16px;\n font-weight: 500;\n margin-bottom: 8px;\n color: #333;\n }\n \n .header .subtitle {\n font-size: 15px;\n color: #dc3545;\n font-weight: 700;\n margin-top: 8px;\n }\n \n .section-header {\n background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);\n color: #fff;\n padding: 10px 15px;\n margin: 25px 0 15px 0;\n font-size: 15px;\n font-weight: 700;\n border-radius: 4px;\n }\n \n .answer-block {\n margin-bottom: 20px;\n padding: 15px;\n background: #f8f9fa;\n border-left: 4px solid #28a745;\n border-radius: 4px;\n page-break-inside: avoid;\n }\n \n .question-header {\n display: flex;\n justify-content: space-between;\n align-items: center;\n margin-bottom: 10px;\n flex-wrap: wrap;\n gap: 10px;\n }\n \n .question-number {\n font-weight: 700;\n font-size: 15px;\n color: #2c3e50;\n }\n \n .correct-answer {\n background: #28a745;\n color: #fff;\n padding: 4px 12px;\n border-radius: 20px;\n font-weight: 700;\n font-size: 13px;\n }\n \n .explanation {\n margin: 12px 0;\n line-height: 1.7;\n text-align: justify;\n }\n \n .explanation strong {\n color: #28a745;\n }\n \n .key-points {\n background: #fff;\n border-left: 3px solid #007bff;\n padding: 12px;\n margin-top: 10px;\n border-radius: 4px;\n }\n \n .key-points-title {\n font-weight: 700;\n color: #007bff;\n margin-bottom: 8px;\n font-size: 14px;\n }\n \n .key-points ul {\n margin-left: 20px;\n margin-top: 5px;\n }\n \n .key-points li {\n margin-bottom: 5px;\n line-height: 1.5;\n }\n \n .summary-section {\n background: #fff3cd;\n border: 2px solid #ffc107;\n padding: 15px;\n margin: 30px 0;\n border-radius: 8px;\n page-break-inside: avoid;\n }\n \n .summary-section h3 {\n color: #856404;\n font-size: 17px;\n margin-bottom: 15px;\n border-bottom: 2px solid #ffc107;\n padding-bottom: 8px;\n }\n \n .summary-section h4 {\n color: #856404;\n font-size: 15px;\n margin: 15px 0 8px 0;\n font-weight: 700;\n }\n \n .summary-section ul {\n margin-left: 20px;\n }\n \n .summary-section li {\n margin-bottom: 6px;\n line-height: 1.6;\n }\n \n .scoring-guide {\n background: #d4edda;\n border: 2px solid #28a745;\n padding: 15px;\n margin: 25px 0;\n border-radius: 8px;\n page-break-inside: avoid;\n }\n \n .scoring-guide h3 {\n color: #155724;\n font-size: 17px;\n margin-bottom: 12px;\n font-weight: 700;\n }\n \n .score-row {\n padding: 8px 0;\n border-bottom: 1px dotted #999;\n display: flex;\n justify-content: space-between;\n align-items: center;\n }\n \n .score-row:last-child {\n border-bottom: none;\n }\n \n .score-range {\n font-weight: 700;\n color: #155724;\n font-size: 14px;\n }\n \n .score-desc {\n color: #155724;\n }\n \n .page-break {\n page-break-after: always;\n margin: 40px 0;\n border-top: 2px dashed #ddd;\n padding-top: 40px;\n }\n \n @media print {\n .page-break {\n border: none;\n padding: 0;\n }\n }\n \n .footer-note {\n text-align: center;\n margin-top: 40px;\n padding-top: 20px;\n border-top: 2px solid #dee2e6;\n font-style: italic;\n color: #6c757d;\n }\n \n .website {\n text-align: center;\n font-size: 16px;\n font-weight: 700;\n color: #007bff;\n margin-top: 12px;\n }\n <\/style>\n<\/head>\n<body>\n <div class=\"header\">\n <h1>PERIPHERAL NERVE ANATOMY<\/h1>\n <h2>Clinical MCQs: Radial, Ulnar & Median Nerves<\/h2>\n <div class=\"subtitle\">ANSWER KEY WITH EXPLANATIONS<\/div>\n <\/div>\n \n <div class=\"section-header\">SECTION A: STANDARD LEVEL (Questions 1-10)<\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 1<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Radial nerve in the spiral groove.<\/strong> The classic presentation of “Saturday night palsy” occurs when the radial nerve is compressed against the humerus in the spiral groove during prolonged pressure. This causes wrist drop, finger drop, and loss of thumb extension. Sensory loss over the first dorsal web space is pathognomonic for radial nerve injury.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Wrist drop is the hallmark sign of radial nerve palsy<\/li>\n <li>First dorsal web space sensory loss distinguishes radial from other nerve injuries<\/li>\n <li>Triceps function preserved if injury is at spiral groove<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 2<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Median nerve – anterior interosseous branch.<\/strong> The anterior interosseous nerve (AIN) is a pure motor branch supplying flexor pollicis longus (FPL) and the lateral half of flexor digitorum profundus (FDP). Injury prevents flexion of the thumb IP joint and index finger DIP joint, making the “OK” sign impossible. There is no sensory loss as this is purely a motor branch.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>AIN is purely motor – no sensory deficit expected<\/li>\n <li>Classic triad: FPL, FDP to index\/middle, pronator quadratus<\/li>\n <li>Unable to make “OK” sign is diagnostic for AIN palsy<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 3<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Carpal tunnel syndrome.<\/strong> CTS involves median nerve compression at the wrist and is the most common entrapment neuropathy. Classic features include thenar atrophy, weak thumb opposition\/abduction, positive Tinel’s sign at wrist, and sensory loss over lateral 3\u00bd digits palmarly.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Most common nerve entrapment syndrome<\/li>\n <li>Positive provocative tests: Tinel’s and Phalen’s<\/li>\n <li>Thenar eminence sensation preserved (palmar cutaneous branch outside tunnel)<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 4<\/span>\n <span class=\"correct-answer\">Answer: C<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Anterior interosseous nerve.<\/strong> Supracondylar fractures can injure the AIN, which innervates flexor pollicis longus (responsible for thumb IP flexion). Unlike main median nerve injury, there is no sensory loss since AIN is purely motor.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>AIN vulnerable in supracondylar fractures<\/li>\n <li>Pure motor deficit without sensory loss<\/li>\n <li>Loss of thumb IP flexion is key finding<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 5<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Ulnar nerve at elbow.<\/strong> Ulnar nerve injury at the cubital tunnel causes clawing of ring and little fingers, weak interossei, positive Froment’s sign, and sensory loss over medial 1\u00bd fingers. This is the second most common entrapment neuropathy.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Clawing more pronounced in ring and little fingers<\/li>\n <li>Froment’s sign indicates weak adductor pollicis<\/li>\n <li>“Claw more in low lesion” – distal lesions show more clawing<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 6<\/span>\n <span class=\"correct-answer\">Answer: D<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Radial nerve.<\/strong> The radial nerve travels in the spiral groove of the mid-shaft humerus, making it the most vulnerable structure in humeral shaft fractures. Results in wrist drop, inability to extend thumb and fingers.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Radial nerve most commonly injured in humeral shaft fractures<\/li>\n <li>Runs directly in contact with bone in spiral groove<\/li>\n <li>Classic triad: wrist drop, finger drop, thumb extension loss<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 7<\/span>\n <span class=\"correct-answer\">Answer: C<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Recurrent motor branch of median nerve.<\/strong> The recurrent (thenar) motor branch has variable anatomy and arises distal to the carpal tunnel to supply thenar muscles. Can be injured during carpal tunnel release surgery, leading to permanent thenar weakness.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Variable anatomy: extraligamentous (50%), subligamentous (31%)<\/li>\n <li>Supplies: APB, opponens pollicis, superficial FPB<\/li>\n <li>Important medicolegal consideration<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 8<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Ulnar nerve.<\/strong> The ulnar nerve innervates adductor pollicis. Froment’s sign indicates adductor pollicis weakness. Preserved thumb opposition and intact thenar sensation confirm isolated ulnar nerve injury.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Froment’s sign is pathognomonic for weak adductor pollicis<\/li>\n <li>Opposition preserved because APB (median nerve) is intact<\/li>\n <li>Sensory pattern confirms isolated ulnar injury<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 9<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Index and middle fingers; median nerve.<\/strong> FDP has dual innervation: median nerve (via AIN) supplies FDP to index\/middle; ulnar nerve supplies ring\/little. Isolated median nerve injury affects DIP flexion of lateral two digits only.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>FDP: Median (index\/middle) vs Ulnar (ring\/little)<\/li>\n <li>Remember: “Median = lateral 2, Ulnar = medial 2”<\/li>\n <li>AIN supplies median portion of FDP<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 10<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Acute carpal tunnel syndrome.<\/strong> Acute CTS secondary to compartment syndrome or hematoma post-fracture. This is a surgical emergency requiring urgent decompression to prevent permanent nerve damage.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Acute CTS is a surgical emergency unlike chronic CTS<\/li>\n <li>Can occur post-trauma (fracture, crush injury)<\/li>\n <li>Requires urgent surgical decompression<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"page-break\"><\/div>\n \n <div class=\"section-header\">SECTION B: ADVANCED LEVEL (Questions 11-20)<\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 11<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Posterior interosseous nerve injury at arcade of Frohse.<\/strong> Preserved triceps indicates injury distal to spiral groove. Normal posterior forearm sensation rules out main radial nerve injury. PIN is purely motor. Arcade of Frohse is the most common site of PIN compression.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>PIN = pure motor (no sensory loss)<\/li>\n <li>Arcade of Frohse most common compression site<\/li>\n <li>Also called “radial tunnel syndrome”<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 12<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Median nerve lesion distal to pronator teres but proximal to carpal tunnel.<\/strong> FCR spared indicates lesion distal to pronator teres. Thenar involvement suggests proximal to carpal tunnel. No sensory loss because palmar cutaneous branch intact. Seen in uremic neuropathy.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>FCR spared = distal to pronator teres<\/li>\n <li>Thenar involvement = proximal to carpal tunnel<\/li>\n <li>Common in hemodialysis patients<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 13<\/span>\n <span class=\"correct-answer\">Answer: A<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Gantzer’s muscle is intact.<\/strong> Classic AIN injury affects FPL, lateral FDP, and pronator quadratus. Gantzer’s muscle (accessory FPL\/FDP head) present in 45-60% can have dual innervation. Pronation maintained by pronator teres.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Gantzer’s muscle present in 45-60%<\/li>\n <li>Can receive anomalous innervation<\/li>\n <li>Pronator teres compensates for paralyzed PQ<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 14<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Ulnar nerve at Guyon’s canal (Zone 1).<\/strong> Handlebar palsy causes ulnar compression at Guyon’s canal. ABSENCE of clawing indicates FDP preserved (distal lesion). Zone 1 affects motor and sensory. Dorsal sensation preserved.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>No clawing because FDP intact<\/li>\n <li>Zone 1 = motor + sensory involvement<\/li>\n <li>Dorsal sensation preserved<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 15<\/span>\n <span class=\"correct-answer\">Answer: C<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Marinacci communication.<\/strong> Marinacci (reverse Martin-Gruber) involves ulnar to median crossover. Proximal ulnar injury affects intrinsic hand muscles, but FDP to ring\/little preserved because fibers traveled via median nerve. Rare (1-4%) but high-yield.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Marinacci = ulnar to median crossover<\/li>\n <li>Very rare: 1-4% vs Martin-Gruber 15-20%<\/li>\n <li>Explains preserved FDP with proximal ulnar injury<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 16<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Ulnar nerve supplies FDP to index, middle, and ring fingers.<\/strong> Isolated middle finger DIP weakness with preserved index suggests anomalous innervation via Martin-Gruber anastomosis. FDP innervation shows variation in up to 30%.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>FDP innervation highly variable (up to 30%)<\/li>\n <li>Martin-Gruber can alter standard pattern<\/li>\n <li>Tests understanding of anatomical variations<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 17<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Anterior interosseous nerve syndrome.<\/strong> “Pseudo-ulnar claw” affects index\/middle (not ring\/little). FDP to index\/middle paralyzed causes lumbricals to lose tension, fingers assume claw position. Intrinsic muscles remain functional. Common in diabetes.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>“Pseudo-ulnar claw” affects index\/middle<\/li>\n <li>Mechanism: FDP paralysis \u2192 lumbrical dysfunction<\/li>\n <li>Intrinsic muscles intact<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 18<\/span>\n <span class=\"correct-answer\">Answer: E<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Posterior interosseous nerve injury.<\/strong> Preserved triceps indicates distal to axilla. Preserved brachioradialis suggests distal to spiral groove. PIN (pure motor) causes wrist\/finger drop. Sensory loss suggests complex injury pattern.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Preserved triceps = distal to proximal arm<\/li>\n <li>Preserved BR = distal to spiral groove<\/li>\n <li>PIN = pure motor<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 19<\/span>\n <span class=\"correct-answer\">Answer: C<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Isolated injury to recurrent motor branch of median nerve.<\/strong> Recurrent branch arises AFTER carpal tunnel with variable anatomy. Supplies thenar muscles. Isolated injury causes pure motor deficit without sensory loss or positive carpal tunnel tests.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Recurrent branch arises DISTAL to carpal tunnel<\/li>\n <li>Negative Tinel’s\/Phalen’s rules out CTS<\/li>\n <li>EMG shows isolated thenar denervation<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"answer-block\">\n <div class=\"question-header\">\n <span class=\"question-number\">Question 20<\/span>\n <span class=\"correct-answer\">Answer: B<\/span>\n <\/div>\n <div class=\"explanation\">\n <strong>Pain with resisted forearm pronation.<\/strong> Pronator syndrome involves median nerve compression in proximal forearm. Key discriminator: pain with resisted pronation compresses nerve between PT heads. Palm sensation affected (unlike CTS). Activity-related, not nocturnal.\n <\/div>\n <div class=\"key-points\">\n <div class=\"key-points-title\">Key Points:<\/div>\n <ul>\n <li>Pain with resisted pronation is pathognomonic<\/li>\n <li>Palm sensation affected (key differentiator from CTS)<\/li>\n <li>Activity-related symptoms, not nocturnal<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n <div class=\"summary-section\">\n <h3>HIGH-YIELD SUMMARY<\/h3>\n \n <h4>Anatomical Variations:<\/h4>\n <ul>\n <li><strong>Martin-Gruber (15-20%):<\/strong> Median to ulnar crossover<\/li>\n <li><strong>Marinacci (1-4%):<\/strong> Ulnar to median crossover<\/li>\n <li><strong>Gantzer’s muscle (45-60%):<\/strong> Accessory FPL\/FDP<\/li>\n <\/ul>\n \n <h4>Localization Rules:<\/h4>\n <ul>\n <li>Triceps preserved = distal to axilla<\/li>\n <li>BR preserved = distal to spiral groove<\/li>\n <li>FCR preserved = distal to pronator teres<\/li>\n <li>No sensory loss = pure motor branch<\/li>\n <\/ul>\n \n <h4>Classic Signs:<\/h4>\n <ul>\n <li><strong>Froment’s:<\/strong> Weak adductor pollicis (ulnar)<\/li>\n <li><strong>OK sign impossible:<\/strong> AIN palsy<\/li>\n <li><strong>Claw hand:<\/strong> Ulnar (ring\/little)<\/li>\n <li><strong>Pseudo-ulnar claw:<\/strong> AIN (index\/middle)<\/li>\n <\/ul>\n <\/div>\n \n <div class=\"scoring-guide\">\n <h3>SCORING GUIDE<\/h3>\n <div class=\"score-row\">\n <span class=\"score-range\">18-20 correct:<\/span>\n <span class=\"score-desc\">Excellent – Ready for exams<\/span>\n <\/div>\n <div class=\"score-row\">\n <span class=\"score-range\">15-17 correct:<\/span>\n <span class=\"score-desc\">Very Good – Review advanced concepts<\/span>\n <\/div>\n <div class=\"score-row\">\n <span class=\"score-range\">12-14 correct:<\/span>\n <span class=\"score-desc\">Good – Focus on variations<\/span>\n <\/div>\n <div class=\"score-row\">\n <span class=\"score-range\">9-11 correct:<\/span>\n <span class=\"score-desc\">Fair – Strengthen basics<\/span>\n <\/div>\n <div class=\"score-row\">\n <span class=\"score-range\">Below 9:<\/span>\n <span class=\"score-desc\">Needs significant review<\/span>\n <\/div>\n <\/div>\n \n <div class=\"footer-note\">\n For more medical MCQs and exam preparation resources\n <div class=\"website\">www.atsixty.com<\/div>\n <\/div>\n<\/body>\n<\/html>\n","protected":false},"excerpt":{"rendered":"<p>Peripheral Nerve Anatomy MCQs – Answer Key PERIPHERAL NERVE ANATOMY Clinical MCQs: Radial, Ulnar & Median Nerves ANSWER KEY WITH EXPLANATIONS SECTION A: STANDARD LEVEL (Questions 1-10) Question 1 Answer: B Radial nerve in the spiral groove. The classic presentation of “Saturday night palsy” occurs when the radial nerve is compressed against the humerus in… <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-26069","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n<title>Answers to Peripheral Nerves MCQ - atsixty<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/atsixty.com\/index.php\/2025\/12\/22\/answers-to-peripheral-nerves-mcq\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Answers to Peripheral Nerves MCQ - atsixty\" \/>\n<meta property=\"og:description\" content=\"Peripheral Nerve Anatomy MCQs – Answer Key PERIPHERAL NERVE ANATOMY Clinical MCQs: Radial, Ulnar & Median Nerves ANSWER KEY WITH EXPLANATIONS SECTION A: STANDARD LEVEL (Questions 1-10) Question 1 Answer: B Radial nerve in the spiral groove. 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