subarcuate fossa

[sŭb-ärkyōō-ĭt, -āt′]
n.
  1. An irregular depression on the rear surface of the petrous portion of the temporal bone, above and a little to the side of the internal ear.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.