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accelerator nerve

n.
  1. Any of the slender unmyelinated nerves establishing the sympathetic innervation of the heart, and originating from the ganglion cells of the superior, middle, and inferior cervical ganglion of the sympathetic trunk.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.