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long thoracic nerve

n.
  1. A nerve that arises from the fifth, sixth, and seventh cervical nerves, descends the neck behind the brachial plexus, and is distributed to the anterior serratus muscle.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.