petrosal fossulamedical dictionary

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.

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

(05 Mar 2000)