4 6 PHYSIOLOGY FOR BEGINNERS CHAP, v 



joint which it forms with the temporal bone on each side just 

 below the ear. The joint acts mainly as a hinge joint, which 

 allows a good deal of side to side movement and some back- 

 ward and forward movement as well as up and down movement. 



In adult life there are about 206 distinct bones in the 

 body, of which twenty-two are in the skull, but the number 

 varies a litllc according to age, because some of the bones 

 unite with other bones as life advances. 



