(1) Caudal to the temporal lobe is the petrous portion of the temporal bone and the mastoid air cells.(2) Behind the temporal regions, note the two wide and deep grooves which outline the petrous parts of the temporal bones.(3) The jugular foramen, a passage between the petrous portion of the temporal bone and the jugular process of the occipital bone, may be divided into two parts by intrajugular processes.(4) The normal course of the internal carotid artery in an adult sees the vessel enter the petrous temporal bone medial to the styloid process via the carotid canal.(5) CT of the petrous temporal bones demonstrated opacification of the left mastoid air cells and left middle ear cavity.
