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"3 Sphenoid bone, frontal view. Sphenoidal sinus, fenestrated

1 Pterygoid process of the sphenoid bone.

Processus pterygoideus. A B

2 Lateral pterygoid plate. Lamina lateralis [processus pterygoidei].AB

3 Medial pterygoid plate. Lamina medialis[pro-cessus pterygoidei]. AB

4 Pterygoid notch (fissure). Incisura ptery-goidea. Fissure formed inferiorly by the diverging medial and lateral pterygoid plates. It is occupied by the pyramidal process of the palatine bone. A

5 Pterygoid fossa. Fossa pterygoidea. Space between the lateral and medial pterygoid plates for the medial pterygoid muscle. AB

6 Scaphoid fossa. Fossa scaphoidea. Oblong depression at the root of the medial pterygoid plate, where the end of the cartilage of the pharyngotympanic tube is located. The tensor velipalatinimuscleoriginatesatitslateralend.A

7 Vaginal process. Processus vaginalis. Small bony ridge medial to the root of the medial pterygoid plate. It borders a small furrow laterally. A B

8 Palatovaginal groove. Sulcus palatovaginalis. Groove which joins the palatine bone to form the palatovaginal canal. B

9 Vomerovaginal groove. Sulcus vomerovaginalis. Groove at the base of the pterygoid process. Together with the vomer, it forms the vomerovagi-nal canal. B

10 Pterygoid hamulus. Hamulus pterygoideus. Hook-like process at the inferior end of the medial pterygoid plate. AB

11 Sulcus of pterygoid hamulus. Sulcus hamuli pter-ygoidei. Groove produced by a sharp bend in the hamulus. B

12 Pterygoid (vidian) canal. Canalis pterygoideus [[canalis Vidii]]. Passage that extends anteriorly in the base ofthe pterygoid process for transmission of the greater and deep petrosal nerves to the pterygopalatine ganglion in the pterygopalatine fossa. A see 11 C

13 Pterygospinous process. Processus ptery-gospinosus. Sharp spine on the posterior edge of the lateral pterygoid plate. A

14 Temporal bone. Os temporale. Bone that lies between the occipital, sphenoid and parietal bones and consists of three parts: petrous, tympanic and squamous. C D E

15 Petrous part (pyramid) of temporal bone. Pars petrosa ossis temporalis. It houses the inner ear. D

16 Occipital border. Margo occipitalis. Margin articulating with the occipital bone. C D

17 Mastoid process. Processus mastoideus. Process located just posterior to the external acoustic meatus. C E

18 Mastoid notch. Incisura mastoidea. Medial notch on the inferior surface of the mastoid process. It gives origin to the posterior belly of the digastric muscle. C

19 Groove for sigmoid sinus. Sulcus sinus sig-moidei. Sulcus on the internal, posterior surface. D

20 Groove for occipital artery. Sulcus a. occipitalis. It lies medial to the mastoid notch and proximal to the occipital margin. C

21 Mastoid foramen. Foramen mastoideum. Opening behind the mastoid process for additional venous drainage from the cranial cavity. C D

22 Facial canal. Canalis fascialis. Canal for the facial nerve. It begins at the opening of the internal acoustic meatus and ends at the stylomas-toid foramen. C D E

23 Genu of facial canal. Geniculum canalis facialis. Sharp bend in the facial canal just below the anterior wall ofthe petrous part ofthe temporal bone, near the hiatus ofthe canal for the greater petrosal nerve. D

24 Canaliculus of chorda tympani nerve. Canaliculus chordae tympani. Narrow passageway for the chorda tympani nerve between the facial canal and the tympanic cavity. D E. Cf. page 381 D

25 Apex of petrous temporal bone. Apex partis petrosae. It is directed anteromedially. C D

26 Carotid canal. Canalis caroticus. Canal for the internal carotid artery. It begins inferiorly and externally between the jugular foramen and the musculotubal canal. C

27 Caroticotympanic canaliculi. Canaliculi caroti-cotypmpanici. Small channels in the wall of the carotid canal for arterial and nerve branches to the middle ear from the internal carotid artery and the carotid plexus. C

28 Musculotubal canal. Canalis musculotubarius. Double canal for the auditory tube and tensor tympani muscle. It lies in front of the carotid canal and leads into the tympanic cavity. C E

29 Semicanal for tensor tympani muscle. Semi-canalis m. tensoris tympani. E

30 Semicanal for the auditory tube. Semicanalis tubae auditoriae (auditivae). E

31 Septum of musculotubal canal. Septum canalis musculotubarii. Bony partition between the above-mentioned semicanals. E

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