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Meckel's cavity

n.
  1. The cavity between the two layers of the dura mater that encloses the roots of the trigeminal nerve and the trigeminal ganglion.trigeminal cavity
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.