thoracodorsal nerve

n.
  1. A nerve that arises from the posterior cord of the brachial plexus, contains fibers from the sixth, seventh, and eighth cervical nerves, and supplies the latissimus dorsi muscle.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.