MASTICATION. 



107 



of teeth is thirty-two, the shapes and names of which it 

 is proper here to present to the student. 



Fig. 75. 



<iab c c d d d 



309. The upper row, Fig, 75, represents the upper teeth 

 on the left side j the lower one, the under teeth on the 

 same side. Those situated in front of the ja\v, the bodies 

 of which are wedge-shaped, are called the incisores, or 

 cutting teeth, a a. At the sides of the cutting teeth, and 

 posterior to them, stand the cuspidati, or canine teeth, b. 

 The bodies of these are also somewhat wedge-shaped, 

 and are usually called the eye-teeth. Next behind the 

 canine, come the bicuspidati, or the first two grinders, c c. 

 The bodies of these are oval, with the surfaces often 

 slightly indented. Behind these stand the molares, d d d, 

 forming the third, fourth, and fifth grinders. In the upper 

 jaw, the last three grinders generally have each three 

 fangs, while the corresponding ones of the under jaw 

 have only two. 



310. The use of the incisores is for cutting and dividing 



What number of teeth has the human species ? What ate their names< 

 and how are they situated with respect to each other ' 



