medial antebrachial cutaneous nerve, a nerve of the arm that arises from the medial cord of the brachial plexus, medial to the axillary artery. Near the axilla a cutaneous branch emerges to supply the skin over the biceps almost as far as the elbow. It descends on the ulnar side of the arm and divides into the anterior branch and the ulnar branch. The anterior branch is the larger of the two branches, innervating the skin as far as the wrist. The ulnar branch descends as far as the wrist, innervates the skin, and communicates with branches of the ulnar nerve. Compare medial brachial cutaneous nerve.
