76 PRACTICAL ANATOMY. 



nerve. The anterior and lateral boundaries are formed 

 by the alveolar processes, teeth, and inferior maxillary 

 bone. 



On the lateral region of the skull is the temporal 

 fossa, limited above by the temporal ridge, in front by 

 the external angular process of the frontal and the 

 posterior concave surface of the malar. Externally, and 

 arching across, is the zygomatic process of the temporal. 

 Internally, and below, is the pterygoid ridge. The 

 fossa is cuneiform in shape, the base of the wedge being 

 directed anteriorly. It is formed by the frontal and 

 great wing of the sphenoid anteriorly, and the squamous 

 portion of the temporal posteriorly; the malar bone is 

 in front. Near the posterior part of the fossa are some 

 shallow grooves for the deep temporal arteries. The 

 temporal muscle arises from the entire extent of the 

 fossa. 



The zygomatic fossa is situated below the temporal 

 fossa ; it is bounded in front by the posterior surface of 

 the superior maxillary and its malar process, and the 

 posterior surface of the malar bone ; above, by the infe- 

 rior surface of the great wing of the sphenoid and the 

 inferior surface of the anterior portion of the temporal ; 

 externally, by the zygoma and inferior maxillary bone ; 

 internally, by the external pterygoid plate; below, by 

 the alveolar process of the superior maxillary ; and, pos- 

 teriorly, by the eminentia articularis. 



The spheno-maxillary is a triangular fossa, situated 

 at the upper inner, anterior part of the zygomatic fossa. 

 It is bounded anteriorly by the posterior border of the 

 superior maxillary ; posteriorly, by the anterior border of 

 the pterygoid process ; above, by the under surface of 

 the body of the sphenoid and zygomatic surface of the 

 orbital process of the palate, and, internally, by the 





