A 26-year-old man presented with worsening numbness, weakness and pain in the distribution of the right ulnar nerve despite night splinting and steroid injection. Nerve conduction studies localized the point of impingement at the elbow.
The ulnar nerve, containing fibers from C-8 and T-1, is the terminal branch of the medial cord of the brachial plexus (see brachial plexus). Its sensory branches supply the elbow joint and ulnar side of the forearm and hand. It supplies motor branches to the flexor carpi ulnaris and ulnar half of the flexor digitorum profundus.
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