Assertion: mastoid process's portion | /r/MadeOf | inner ear structures
Facets:
Source sentences:
text: The petrous portion is a quadrangular pyramid that forms the bulk of the internal surface of the temporal bone, extends to the petrous apex, and contains the inner ear structures (vestibule, semicircular canals, cochlea) and virtually all major neurovascular compartments (internal auditory canal [IAC], carotid canal, jugular fossa).