Claw hand is caused by ______________?
Correct answer: B. Ulnar nerve
- A. Radial nerve
- B. Ulnar nerve
- C. Median nerve
- D. Vidian nerve
Explanation
An ulnar nerve lesion paralyzes the interossei and medial two lumbricals, producing hyperextension at the MCP joints and flexion at the IP joints, the posture called claw hand. Radial nerve injury instead produces wrist drop.
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