THE DIGESTIVJE SYSTEM. 



229 



narian/ vol. xii, p. 143, is recorded a most remarkable case 

 of a normally formed incisor being developed in tbe centre 

 of the palate of a young bull. 



Fig. 39.— Teeth of the ox. 1. Upper: a, from below; h, from side. 

 2. Lower : a, from above ; b, from side. (Chauveau.) 



The hard palate of the ox is wide and roomy poste- 

 riorly at its intermolar portion, but in front of this is 

 narrowed by the ridges, convex inwards, which afford 

 attachment to Canini. These muscles contract during 

 mastication, and thus diminish the anterior opening of the 

 mouth, at the same time leaving the lips free to act. The 

 muscles of mastication in ruminants are well developed. 

 Pterygoideus and masseter internus are large, and masseter 



