Gross Anatomy USMLE Step 1 Practice Question
A 41-year-old carpenter presents with progressive weakness of finger extension following repetitive screwdriver use. Vital signs are normal (BP 128/82, HR 72, RR 14, Temp 37°C). Examination reveals weak finger extension and radial wrist deviation; sensation over the dorsum of the hand is intact. EMG shows denervation in extensor carpi radialis and extensor digitorum muscles. Grip strength is preserved. Compression of which of the following nerves is the most likely cause?
Answer choices
- AUlnar nerve
- BMedian nerve
- CRadial nerve
- DAxillary nerve
- EPosterior interosseous nerveCorrect answer
- FSuperficial radial nerve
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