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9 Superior border of petrous temporal bone.

Margo superior partis petrosae. A C

10 Groove for superior petrosal sinus. Sulcus sinus petrosi superioris. Its course is on the upper margin of the petrous part of the temporal bone. AC

11 Posterior surface of petrous part of temporal bone. Facies posterior partis petrosae. A

12 Porus acusticus internus. Opening of internal acoustic meatus on the posterior wall of the petrous part ofthe temporal bone. A

13 Internal acoustic (auditory) meatus. Meatus acus-ticus internus. It transmits cranial nerves VII and VIII and vessels. A

14 Subarcuate fossa. Fossa subarcuata. Depression lateral and superior to the internal acoustic meatus. In the fetus, it lodges the flocculus of the cerebellum. A

15 Aqueduct of vestibule. Aqueductus vestibuli. Narrow canal extending from the endolym-phatic space of the inner ear to the posterior wall of the petrous part of the temporal bone.

16 External opening of vestibular aqueduct. Apertura externa aqueductus vestibuli. A

17 Posterior border of petrous part of the temporal bone. Margo posterior partis petrosae. A B

18 Groove for inferior petrosal sinus. Sulcus sinus petrosi inferioris. A

19 Jugular notch. Incisura jugularis. Indentation forming the anterior margin of the jugular foramen. A B

20 Intrajugular process. Processus intrajugularis. It divides the jugular foramen into a posterolateral part for the internal jugular vein and an an-teromedial part for cranial nerves IX, X and XI. A B

21 Cochlear canaliculus. Canaliculus cochleae. Bony canal for the cochlear aqueduct.

22 External opening of cochlear canaliculus. Apertura externa canaliculi cochleae. It lies medially in front of the jugular fossa. B

23 Inferior surface of petrous temporal bone. Facies inferior partis petrosae. B

24 Jugular fossa. Fossa jugularis. Enlargement of the jugular foramen for the superior bulb of the internal jugular vein. B

25 Mastoid canaliculus. Canaliculus mastoideus. Narrow canal for the auricular branch of the vagus nerve. It begins in the jugular fossa. B

26 Styloid process. Processus styloideus. Long process located laterally in front of the jugular fossa. It is a vestige of the second branchial arch. AB D

27 Stylomastoid foramen. Foramen stylomas-toideum. External opening of the facial canal located behind the styloid process and between the mastoid process and the jugular fossa. B

28 Tympanic canaliculus. Canaliculus tympanicus. Minute canal in the petrosal fossula traversed by the tympanic nerve and inferior tympanic artery. B

29 Petrosal fossula. Fossula petrosa. Slight depression in the bony ridge between the carotid canal and the jugular fossa. It is occupied by the tympanic ganglion of the glossopharyngeal nerve. B

30 Tympanic (middle ear) cavity. Cavitas tym-panica. Narrow, air-filled space between the osseous labyrinth and the tympanic membrane.

31 Petrotympanic fissure [glaserian fissure]. Fissura petrotympanica. Fissure situated dor-somedial to the fossa of the temporomandibular joint, between the tympanic part of the temporal bone and the visible petrous strip. The medial part lodges the chorda tympani nerve. B D

32 Petrosquamous fissure. Fissura petrosqua-mosa. It lies on the skull base in front of the petrotympanic fissure between the visible petrous strip and the squamous partofthe temporal bone. B C

33 Squamotympanic fissure. Fissura tympa-nosquamosa. Lateral continuation of the two above mentioned fissures after they unite. B D

34 Tympanomastoid fissure. Fissura tym-panomastoidea. Suture between the tympanic part of the temporal bone and the mastoid process. Exit site of the auricular branch of the vagus nerve. B D

"A Right temporal bone, medial view

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