The deep branches of the ulnar artery and ulnar nerve [the ulnar nerve is elevated by the two probes and the ulnar artery is displaced medially] will be identified in the distal forearm and followed into the palm of the hand. First, retract, or reflect distally, the distal ends of the flexor digitorum superficialis muscle and flexor digitorum profundus muscle.
To more clearly visualize the deep branches of the ulnar artery and nerve, reflect distally the flexor digiti minimi muscle. Carefully clean the deep branch of the ulnar nerve and accompanying deep branch of the ulnar artery as they pass deep to the long flexor tendons. The deep branch of the ulnar nerve supplies the hypothenar muscles, third and fourth lumbrical muscles, palmar and dorsal interossei muscles, and adductor pollicis muscle.
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