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petrotympanic fissure

(pĕt′rō-tĭm-pănĭk)
n.
  1. A fissure between the tympanic and petrous portions of the temporal bone.glaserian fissure
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.