DIGESTIVE SYSTEM 



313 



Sublingual 



Bile Sac 



Parotid. 



-Submaxillary 



, Liver 



set in sockets formed in the bone of the upper and 

 lower jaws. In a complete set of an adult there are 

 thirty two teeth. 

 They are not all 

 alike. In front 

 in each jaw there 

 are four teeth 

 with chisel shaped 

 edges, the incisors, 

 which are used for 

 cutting the food. 

 On each side of 

 these there is one 

 pointed tooth. Be- 

 cause of their re- 

 semblance to the 

 teeth of a dog, 

 these two teeth are 

 called the canine 

 teeth. Their shape 

 fits them for tear- 

 ing the food. Just 

 behind each canine 

 tooth there are two 

 teeth which have the biting surface divided into two 

 parts. These are the bicuspids, (Latin, bis meaning 

 twice, and cuspis, a point). The three teeth on each 

 side back of the bicuspids are the molars. These have 

 broad flat surfaces for grinding the food into small 



Fig. 149. The digestive glands. 



