1 — Styloid process; 2 — Internal acoustic meatus; 3 — Apex of petrous part; 4 — Zygomatic process; 5 — Groove for sigmoid sinus; 6 — Mastoid foramen; 7 — Arterial grooves; 8 — Mastoid cells; 9 — Facial nerve [VII]; 10 — Chorda tympani; 11 — Tympanic membrane; 12 — Canal for pharyngotympanic tube; Canal for auditory tube; 13 — Internaljugular vein; 14 — Internal carotid artery; 15 — Mastoid process; 16 — Carotid canal; 17 — Petrous part; 18 — Anterior surface of petrous part; 19 — Groove for greater petrosal nerve; 20 — Sphenoidal margin; 21 — Groove for lesser petrosal nerve; 22 — Hiatus for lesser petrosal nerve; 23 — Hiatus for greater petrosal nerve; 24 — Parietal margin; 25 — Cerebral surface; 26 — Petrosquamous fissure; 27 — Arcuate eminence; 28 — Tegmen tympani; 29 — Groove for superior petrosal sinus; 30 — Parietal notch; 31 — Occipital margin; 32 — Superior border of petrous part; 33 — Trigeminal impression
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