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thoracic ganglion

n.
  1. Any of 11 or 12 ganglions at the level of the head of each rib on either side that with the connecting nerve cords constitute the thoracic portion 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.