superior cervical cardiac nerve

n.
  1. A nerve that arises from the lower part of the superior cervical ganglion of the sympathetic trunk and that passes down to form, with branches of the vagus nerve; the cardiac plexus.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.