20 



ELEMENTARY PHYSIOLOGY 



but it must be understood that in early childhood some of these 

 bones consist of parts which are quite distinct ; also that, in the 

 adult, some of the bones which are considered to be distinct are 

 fused together into one mass. 



Fig. 20. The Skull (Front View). 



i, frontal bone ; 2, parietal bones ; 3, temporal bones ; 4, portions of the sphenoid bones, 

 forming^ the backs of the orbits of the eyes ; 5, nasal bones ; 6, superior maxillary bones ; 

 7, inferior maxillajy bone ; 8, malar or cheek bones. 



The bones of the cranium or brain-case are 



One occipital. 

 Two parietal. 

 One frontal. 



Two temporal. 

 One sphenoid. 

 One ethmoid. 



They are united by means of irregular saw-like edges which 

 firmly lock them together. 



