In a failed suicide gesture, a depressed student severs her radial nerve at the wrist. The expected disability is:
|A||Loss of ability to extend the wrist|
|B||Loss of ability to flex the wrist|
|C||Wasting of the intrinsic muscles of the hand|
|D||Sensory loss over the thenar pad and the thumb web|
Sensory loss over the thenar pad and the thumb web
a. An injury to the radial nerve at the wrist would cause primarily sensory abnormalities.
b. The dorsum of the hand from the radial aspect of the fourth digit over the thumb, including the thenar pad and thumb web, becomes insensate after severance of the radial nerve at the wrist.
c. Radial injuries more proximally would impair extension of the wrist and digits as well as forearm supination.