Fossula petrosa

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Fossula petrosa --> petrosal fossula

a small and often only faintly marked depression on the inferior surface of the petrous portion of the temporal bone, between the jugular fossa and the opening of the carotid canal; here opens the canaliculus tympanicus transmitting the tympanic nerve.

Synonym: fossula petrosa, petrosal fossa, receptaculum ganglii petrosi.