musculocutaneous nerve

n.
  1. A nerve that arises from the lateral cord of the brachial plexus, and that passes through the coracobrachial muscle and then downward between the brachial and the biceps muscles, supplying these three muscles and being prolonged as the lateral cutaneous nerve of the forearm.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.