THE TEETH 



413 



The first lower incisor (Fig. 329) is the smallest of the three ; it 

 is, therefore, the smallest tooth of the entire permanent series. 



The second lower incisor (Fig. 330) is distinctly larger, with a 

 broader crown and a stouter fang. The cutting edges of these teeth 

 present three small cusps ; the middle cusp is nearer the inner angle, 

 hence the edge appears to slope downward and outward. Inasmuch 

 as the lower incisors bite behind and between the upper incisors, the 

 anterior surface and the larger outer part of the cutting edge may 

 exhibit signs of wear. 



FIG. 331. 



Outer Cusp.. 



/Middle Cusp. 

 Inner Cusp. 

 Neck. 



Middle 

 Cusp. 



-Fang. 



Outer Cusp. 

 Neck. 

 Fang, 



ANTERIOR 

 ASPECT. 



POSTERIOR 

 ASPECT. 



OUTER 

 ASPECT. 



RIGHT THIRD LOWER INCISOR TOOTH. 



The crown of the larger third lower incisor (Fig. 331) is chisel- 

 shaped like the rest, and not conical like the corresponding upper in- 

 cisor. The inner and middle cusps are close together ; the outer cusp 



is small, but very distinct. 



FIG. 332. 



Posterior Inner Border. ' 



Inner Surface. 



Cingulum. 



Fang. 



Posterior Inner 

 Border. 



.Posterior Outer 

 Surface. 



-Cingulum. 



-Fang. 



INNER ASPECT. 



OUTER ASPECT. 

 RIGHT LOWER CANINE TOOTH. 



POSTERIOR ASPECT. 



The lower canine (Fig. 332), which is placed close to the incisors, 

 is directed outward and forward as well as upward ; it passes in front 

 of the upper incisor and medial to it (Fig. 336). 



