46 



ELEMENTS OF MAMMALIAN ANATOMY 



two orhitosphcnoids, extending dorso-laterally from the pre- 

 sphcnoid and articulating craniad with the frontals. In an 

 old cat, the sutures between these eight parts become more 

 or less obliterated. The basisphenoid together with the ali- 

 sphcnoids is sometimes called the posterior sphenoid in distinc- 

 tion to the anterior sphenoid, composed of the presphenoid 

 and orbitosphenoids. 



TABLE OF THE FORAMINA OF THE SKULL 



Foramina 



Bones surrounding 

 the foramina 



Structures traversing the 

 foramina 



InfraorbitaL 

 Anterior palatine. 



Sphenopalatine. 



Posterior palatine. 



Olfactory f o r a - 

 mina. 



Optic. 



Lacerum anterius, 

 or sphenoidal si- 

 nus. 



Rotundum. 



Ovale. 



Lacerum medium. 



Internal acoustic 



meatus. 

 Canalis facialis. 



Stylomastoid. 



Jugular or poste- 

 rior lacerated. 

 Hypoglossal canal. 



Superior maxillary. 



Maxillary and p r c • 

 maxillary. 

 Palatine. 

 Palatine. 

 Ethmoid. 



Orbitosphenoid. 

 Alisphenoid and or- 

 bitosphenoid. 



Alisphenoid. 



Alisphenoid. 

 Petrous and basisphe- 

 noid. 

 Petrous. 



Petrous, mastoid, and 

 tympanic. 



Tympanic and mas- 

 toid. 

 Occipital and tem- 

 poral. 



Exoccipital. 



Infraorbital nerve of the superior 

 maxillary division of the fifth. 



Nasopalatine branch of the fifth 

 cranial nerve and nasal artery. 



Sphenopalatine nerve. 



Palatine nerve and artery. 



Olfactory nerve. 



Optic nerve and meningeal artery. 

 Third, fourth, and sixth cranial 



nerves and first division of fifth 



cranial nerve. 

 Second division of fifth cranial 



nerve. 

 Third division of fifth cranial nerve. 



Internal carotid artery. 



Eighth cranial nerve. 



Seventh cranial nerve. 



Seventh cranial nerve. 



Ninth, tenth, and eleventh cranial 

 nerves and jugular vein. 

 Twelfth cranial nerve. 



The basisphenoid presents on its dorsal or cerebral surface the 

 sella turcica, or hypophyseal fossa, which lodges the hypophysis 



