AND PHYSIOLOGY. 



43 



107. Frontal, 

 Trmporal, Parie- 

 tNbj Occipital, 

 Spdenoid, and Eth- 

 moid Bones. — The 

 Frontal Bone is sit- 

 uated in the upper 

 and front part of 

 the head, occupy- 

 ing that portion of 

 the skull called the 

 forehead. It is 

 mainly a flat bone, 

 but the portion 

 lying above the eye 

 is hollow, in order 

 that protection may 

 be afforded to this 

 delicate organ, as 

 well as to give sufficient 

 prominence to the up- 

 per part of the face. 

 The two Temporal Bones 

 cover the front part of 

 each side of the skull 

 in that position com- 

 monly known as the 

 temples, and each bone 

 is a little larger than 

 the space which is pro- 

 tected by the external 

 ear. In the inner por- 

 tions, called the petrous, 

 are located the organs 



Fig. 44. 



1, Frontal. 2, Parietal. 3, Occipital. 4, Temporal. 



5, Nasal 

 9, Mandible. 



6, Malar. 7, Upper Jaw. 8, Lachrymal. 



FlG. 45. 



Frontal Bone. 1, Frontal Protuberance of right 

 side. 2, Superciliary ridge. 3, Superorbitary 

 ridge. 4 and 5, Angular processes. 



107. What kind of a bone is the Frontal ? Why is a portion of it hollow ? W hero are 

 the Temporal Bones located ? 



