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How To Do an Ulnar Nerve Block
Relevant Anatomy
The ulnar nerve lies along the ulnar aspect of the wrist, medial (ulnar) to the ulnar artery. The artery and the nerve are deep to the flexor carpi ulnaris tendon, which inserts on the pisiform. The dorsal cutaneous branches of the nerve wrap around the ulna to innervate the dorsum of the ulnar side of the hand. 