What does digital clawing indicate?
A. Weakness or absence of the extensor muscles
B. Weakness or absence of the intrinsic muscles of the hand
C. Weakness or absence of the flexor muscles of the hand
D. Flexor tenosynovitis
ANS: B
The ulnar nerve in the forearm innervates only the flexor carpi ulnaris and the median half of the flexor digitorum profundus. It travels down the volar forearm through the canal of Guyon, in-nervating the intrinsic muscles of the hand, including the palmaris brevis, abductor digiti minimi, opponens digiti minimi, flexor digiti minimi, dorsal and volar interossei, third and fourth lumbri-cals, and medial head of the flexor pollicis brevis. The sensory distribution of the ulnar nerve is the dorsal and volar surfaces of the small finger ray and the ulnar half of the dorsal and volar surface of the ring finger ray.
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