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petrous ganglion in Medicine

petrous ganglion

n.
  1. The lower of two sensory ganglions on the glossopharyngeal nerve as it traverses the jugular foramen.inferior ganglion of glossopharyngeal nerve
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.