70 EQDLNE ANATOMY. 



groove for the parieto-temporal caual. The circum- 

 ference is divided into an anterior and posterior border. 

 Development : one nucleus of ossification. 



Tuberous. — Four faces, four borders, a base and an 

 apex. The faces are articular, except the internal, 

 whicli offers the internal auditory hiatus, the internal 

 opening of the aqueduct of Fallopius. Of the borders, 

 one, the postero-external, forms the mastoid crest and 

 the mastoid process ; another, the antero-iuternal, gives 

 attachments to the tentorium cerebelli. The apex is 

 articular. The base shows the external auditory hiatus, 

 the stylo-mastoid foramen, a sharp subuliform process, 

 the mastoid protuberance, and hyoid process. Devel- 

 opment ! two nuclei of ossification. 



Face — Division: Superior jaw, nineteen bones — 

 great superior maxillary, small superior maxillary, 

 nasal, lachrymal, zygomatic, palate, pterygoid, nasal 

 and maxillary turbinated, and vomer. Inferior jaw, 

 one bone — the inferior maxillary. 



Great super-maxillary. — Division : Two faces, 

 two borders, and two extremities. The external face 

 presents the maxillary spine and the inferior open- 

 ing of the super-maxillo-dental canal ; the internal 

 face is a part of the maxillary sinus, and exhibits the 

 palatine duct, a crest for attacliment of the maxillary 

 turbinated, the palatine process and the palatine fis- 



