-J.J 



MAMMALIAN ANATOMY 



FIG. 258. 



fissure (Fig. 259) ; it is bounded by the pterygoid process, the maxil- 

 lary, and the palatine ; it terminates below in the posterior palatine 



canal, and enlarges above into the 

 dorsal part, or spheno-maxillary fossa, 

 which is bounded by the front of the 

 roots of the pterygoid process and great 

 wing of the sphenoid, and by the pala- 

 tine and the maxillary. 



The upper part of the spheno- 

 maxillary fossa is prolonged outward 

 and forward between the maxillary and 

 the large wing of the sphenoid, as the 

 spheno-maxillary fissure, which, inas- 

 much as it separates the outer and lower 

 walls of the orbit, is also known as the 

 inferior orbital fissure. 



The spheno-maxillary fossa com- 

 municates on the outer side with the 

 zygomatic fossa ; below with the cavity 

 of the mouth through the posterior 

 palatine canals ; above with the orbit ; 

 on the median side with the cavity of 

 the nose through the spheno-palatine 

 foramen piercing the vertical plate of 

 palatine. Into the back of the fossa 

 the foramen rotundum, the Vidian 

 canal, and the pharyngeal canal, some- 

 times called the pterygoid canal. 



When we compare the human pala- 

 tine (Figs. 261, 262) with the palatine 

 cat, we recognize at a glance the 



/ o o 



EXTERNAL VIEW OP THE BASE 

 THE SKULL. RIGHT SIDE. 



OF 



1, palatine plate of the maxillary ; 2, palatine 

 plate of the palatine bone; 3, vomer; 4, 5, 

 internal and external pterygoid plates; 6, 

 pyramidal process of the palatine bone ; 5, 6, 

 occupy the pterygoid fossa; 7, under part of 

 the great wing of the sphenoid bone, forming 

 part of the zygomatic fossa ; 8, temporal sur- 

 face of the great wing of the sphenoid bone ; 

 9, zygoma ; 10, zygomatic process of the malar 

 bone; 11, zygomatic process of the temporal 

 bone; 12, squamous portion of the temporal 

 bone; 13, articular eminence; 14, glenoid 

 fossa ; 15, tympanic plate ; 16, styloid process ; 

 17, auditory meatus; 18, mastoid process; 19, 

 digastric fossa ; 20, conjunction of the basilar 

 process and body of the sphenoid bone; 21, 

 occipital condyle; 22, occipital protuberance, 

 and crest leading from it downward; 23, 24, 

 superior and inferior semicircular lines; 25, 

 occipital foramen; 26, anterior palatine fossa; 

 27, posterior palatine foramen; 28, spheno- oreat change which liaS taken phlCC by 

 maxillary fissure; 29, posterior naris; 30, & 



foramen ovale; 31, foramen spinosum; 32, reas oil of the reduction of tllC ailtei'O- 

 lacerate foramen; 33, Eustachian tube; 34, 



entrance of the carotid canal; 35, jugular fora- posterior length aild tll6 increase ill the 

 men; 36, stylo-mastoid foramen; 37, pit with 



a posterior condyloid foramen; 38, mastoid doi'SO-VCHtral height. TllC horizontal 

 foramen. 



plate projects forward only slightly be- 

 yond the vertical plate ; the posterior part, which in the cat is very 

 long, is almost entirely wanting; the posterior palatine and spheno- 



