194 



MAMMALIAN ANATOMY 



anterior glenoid process. The posterior margin is produced down- 

 ward and forward at the inner end into the triangular postgleuoid 

 process. The glenoid cavity is lined with cartilage, and receives the 

 condyle of the lower jaw. In front of the glenoid cavity, and on the 

 outside of it, the lower surface of the zygomatic process is continuous 

 with the posterior-inferior border. 



The posterior part of the inferior-external surface of the zygomatic 

 process is behind the postglenoid process, and continuous with the 

 under surface of the posterior root of the zygoma. It is smooth and 

 irregularly convex from behind forward. It faces backward and 



FIG. 131. 



.-. 



End of Zygomatic Process. \ 



Glenoid Cavi 

 Postglenoid Process. 



Area of Attachment of 

 Ectotympanic. 



Part of Outer Wall of Tympa- 

 num. 



Posterior Attachment of 

 Ectotympanic. 



Tlie Bridge. 



Groove ; Part of Stylo-mastoid 

 Foramen. 



Mastoid Process. 



Under Surface of Posterior Root of Zygomatic Process. 

 Upper Margin of Auditory Meatus. 



INFERIOR SURFACE OF SQUAMOUS PORTION OF TEMPORAL BONE; THE PETROUS 



AND TYMPANIC PORTIONS REMOVED. 



downward at its beginning ; then backward, downward, and outward ; 

 then outward, and at the extremity also outward and slightly forward, 

 there being no break between the stout basal portion and the slender 

 extremity. It is higher behind, in the region of the postglenoid 

 process, and narrower in front of the region of the glenoid cavity, 

 inasmuch as from that point its lower border is bevelled and over- 

 lapped by the malar, as already mentioned. Just behind the inner 

 end of the postglenoid process is a postglenoid foramen, more or less 

 well marked, which transmits a vessel from the diploe. 



The inferior surface of the squanious (Fig. 131) is little more than 

 a border separating the external and internal surfaces. For the first 



