FOSS.E OF SKULL 



33 



of the skull (Fig. 20). It is bounded by the temporal ridge and 

 the zygomatic arch, occupied by the temporal muscle, and covered 

 by a strong membrane, called the temporal fascia, through which 

 the motion of the muscle may be felt. 



Infratemporal (or zygomatic) fossa. At the side of the skull 

 below the temporal fossa, from which it is separated by the zygo- 

 matic arch (Fig. 20). It is covered by the ramus of the mandible, 

 and occupied by two of the muscles oj mastication, and also by a 

 number of important arteries, veins, and nerves. 



Concha superior 

 Sphenoidal sinus 



Middle meatus 



Palate bone 

 Inferior meatus 



FIG. 25. LATERAL WALL or NASAL FOSSA OR CAVITY. (Morris.] 



Orbital fossa (or orbit). containing the eye. It is shaped 

 like a pyramid, the apex being at the back of the fossa. The 

 large opening on the face is bounded by the margins of the orbit, 

 having the frontal bone above, the maxilla below, and the zygo- 

 matic bone on the lateral side. 



The orbital plate of the frontal bone is in the roof of the orbit, and the 

 3 



