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sacral ganglion

n.
  1. Any of three or four ganglions on either side that constitute the pelvic portion of the sympathetic trunk with the coccygeal ganglion and the connecting cords.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.