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The medial cutaneous nerve of the forearm branches from the medial cord of the brachial plexus. It contains axons from the ventral rami of the eighth cervical and first thoracic nerves.
It gives off a branch near the axilla, which pierces the fascia and supplies the skin covering the biceps brachii, nearly as far as the elbow.
The nerve then runs down the ulnar side of the arm medial to the brachial artery, pierces the deep fascia with the basilic vein, about the middle of the arm, and divides into a volar and an ulnar branch.
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