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external carotid nerve

n.
  1. Any of the sympathetic nerve fibers extending upward from the superior cervical ganglion along the external carotid artery, forming the external carotid plexus.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.