THE TEETH. 



G47 



The neck is distinct, large, and rounded. 



The root is subdivided into from two to five fangs, each of which presents an 

 aperture at its summit. 



The first molar tooth is the largest and broadest of all; its crown has usually 

 five cusps, three outer and two inner. In the upper jaw, the root consists of 

 three fangs, widely separated from one another, two being external, the other 

 internal. The latter is the largest and the longest, slightly grooved, and some- 

 times bifid. In the lower jaw, the root consists of two fangs, one being placed in 

 front, the other behind ; they are both compressed from before backwards, and 

 grooved on their contiguous faces, indicating a tendency to division. 



The second molar is a little smaller than the first. 



The crown has four cusps in the upper, and five in the lower jaw. 



The root has three fangs in the upper jaw, and two in the lower, the characters 

 of which are similar to the preceding tooth. 



The third molar tooth is called the wisdom tooth (dens sapientise), from its late 

 appearance through the gum. It is smaller than the others, and its axis is directed 

 inwards. 



The crown is small and rounded, and furnished with three tubercles. 



The root is generally single, short, conical, slightly curved, and grooved so as 

 to present traces of a subdivision into three fangs in the upper, and two in the 

 lower jaw. 



TEMPORARY TEETH. 



The temporary or milk teeth are smaller, but resemble in form those of the 

 permanent set. The hinder of the two temporary molars is the largest of all the 



Fig. 321. The Temporary or Milk Teeth. External View. 



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milk teeth, and is succeeded by the second permanent bicuspid. The first upper 

 molar has only three cusps, two external, one internal ; the second upper molar 

 has four cusps. The first lower molar has four cusps ; the second lower molar 

 has five. The fangs of the temporary molar teeth are smaller, and more diverging 

 than those of the permanent set ; but, in other respects, bear a strong resemblance 

 to them. 



