THE MOUTH 



413 



certain exceptions noted below) complex tuberculate crowns; the term bunodont 

 is applied to this condition, as distinguished from the selenodont structure in 

 horses and cattle, in which there are prominent ridges of enamel. They are 

 short-crowned teeth with a distinct neck and root. The first tooth in each 

 jaw is small, simple, and appears only once; in the lower jaw it is near the 

 canine, in the upper near the second cheek tooth. The next two teeth are larger, 

 laterally compressed, and sectorial. The fourth tooth below is larger, but otherwise 

 like the preceding ones, while the upper one is much wider and is tuberculate. 



Fig. 309. — Superficial Glands of Head of Pig. 

 a, Parotid gland; a' , a", cervical and submaxillary angles of a; h, c, ventral and dorsal buccal glands; 

 d, labial glands; e, masseter muscle; /, /'.lymph glands; g, dotted line indicating outline of submaxillary gland, 

 which is concealed. (EUenberger-Baum, Anat. d. Haustiere.) 



The average periods of eruption of the teeth are given in the subjoined table. 



Tooth 

 I.. 



I.. 



c . 

 Pf 



p.. 

 P3. 



P4. 



M,. 

 M2. 

 M,. 



Eruption Change 



. 2 to 4 weeks 12 months 



. / upper 2 to 3 months 



\ lower 13^ to 2 months IG to 20 months 



. Before birth 8 to 10 months 



. Before birth 9 to 10 months 



. .5 months 



. 5 to 7 weeks ] 



. / upper 4 to 8 daj's | 



\ lower 2 to 4 weeks J- 12 to 15 months 



. / upper 4 to 8 daj's 



\ lower 2 to 4 weeks J 



. 4 to 6 months 



. 8 to 12 months 



. IS to 20 months 



