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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
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.