336 



MAMMALIAN ANATOMY 



bers, the floors of the orbits, and the roof of the mouth (Fig. 263). 

 In them are implanted the larger and most important of the upper 

 teeth. They are in contact with each other for a short distance below, 

 while assisting in the formation of the hard palate, but they are 



FIG. 263. 



SIDE VIEW. LOWER VIEW. 



POSITION OF THE MAXILLARY BONE. 



separated from each other in front by the premaxillaries, behind 

 by the palatines, and above by the nasals, the lachrymals, and the 

 frontals. 



Each maxillary may be described as consisting of a bony bar, or 

 body, and three processes. The body is narrow in front and wider 

 behind. The upper teeth are embedded in its lower surface. The 

 three processes arising from the body are : from its inner surface, a 

 broad horizontal palatine plate ; from its upper surface, in front, a 

 high nasal process which slopes inward ; and from the back part, a 

 low malar process which slopes outward. 



The Body has five surfaces : an external or facial, a superior or 

 orbital, an inferior or oral, an internal or nasal, and a posterior or 

 zygomatic. 



