338 



MAMMALIAN ANATOMY 



surface is marked by lesser depressions at the intervals between the 

 premolar teeth. On a posterior flat triangular area, which extends 

 upward on the malar process, is attached the masseter muscle. The 

 lower margin of the surface is straight, and shows the emargination 



FIG. 265. 



Nasal or Ascending Process, 



With Nasal. 



With Frontal. 



With Lachrymal. 



With Malar. 



Maxillo-turbinal. 



With Premaxillary. 

 Arrow through Infra- 

 orbital Fora wen. 



With Palatine. 



Malar Process. 



Tnberositij. 



Alveolar Border. 

 LEFT MAXILLARY BONE, OUTER SURFACE, SIDE VIEW. 



due to the alveoli 1 or teeth sockets. The posterior border is short, 

 vertical, and rounded, passing backward above into the posterior 

 border of the malar process. 



The superior or orbital surface (Fig. 266) is half as wide as long, 

 and wider behind than in front, where it ends as the floor of the infra- 

 orbital foramen. It is faintly concave from side to side, and faces 

 upward, inward, and slightly backward. It is marked by many 

 small inconstant foramina, the openings into dental canals. One 

 large foramen near the front of the inner margin appears to be con- 

 stant. The posterior margin of the superior surface is emarginate 

 and rounded, passing down into the posterior, or zygoniatic, surface. 

 It is directed forward and outward. Near its inner end is a small 

 oblique notch. 



The inner border is divided into three nearly equal parts : 

 The first part begins as a sharp, elevated line at the inner margin 

 of the infraorbital foramen, separates the orbital surface from the nasal 

 surface of the palatine plate, and runs backward and inward to end 



1 Alveolus, a small cavity. 



