A physician notes weakness of a patient’s thumb in extension, although rotation, flexion, abduction, adduction, and opposition are normal. Which of the following nerves is most likely involved?
Correct Answer: Radial only
Description: All three of the nerves listed innervate muscles that supply the thumb. Extension is provided by the extensors pollicis longus and brevis, which are innervated by the radial nerve. Ref: Maheshwari 6e pg 63,65.
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Orthopaedics
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