122 



BONES OF THE SKULL. 



and to the bones of the skull ; the principal of these are the 

 superior maxillaries, Fig. 92 (2), forming nearly the whole of 



Fig. 91. 



the upper jaw, and which 

 are connected with the 

 frontal bone in such a 

 manner as to contribute 

 to the formation of the 

 orbits (4) and the nasal 

 cavities (fig. 93,6); they 

 form the anterior part 

 of the roof of the mouth, 

 and unite with the malar 

 bones (1), to constitute 

 the prominence of the 

 cheeks ; behind they 

 unite with the palate 

 bones. In the interior of 

 the nasal fossae are found two spongy bones (figs. 94 and 95), 

 curiously folded, upon which the mucous membrane of the nose 

 Fig. 92. 



Fig. 93. 



is spread. It is through the horizontal cribriform plate of the 

 ethmoid bone, which separates the nasal cavity from that of the 

 skull, that the olfactory nerves proceed into the nasal fossae 



