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parasympathetic ganglion

n.
  1. Any of the ganglia of the autonomic nervous system composed of cholinergic neurons receiving afferent fibers originating from preganglionic visceral motor neurons in either the brainstem or the middle sacral segments of the spinal cord.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.