396 DIGESTIVE SYSTEM OF THE HORSE 
The blood-supply to the pulp is derived from the alveolar branches of the in- 
ternal maxillary artery; the nerve-supply comes from branches of the trigeminus. 
THE TEETH OF THE HORSE! 
THE PERMANENT TEETH 
The formula of the permanent teeth of the horse is: 
3 iL 3 or 4 3 
I-C-P M — } = 40 or 42 
3 iL 3 3 
bo 
Se) ee Sen oo 
Fig. 334.—Uprer Treeta or Horse, Anout Four aNnD ONE-HALF Fic. 
335 —Lowrr TrerrH oF Horse, 
Years OLp. 
Four Years or AGE. 
I1, I?, I3, Incisors; C, canine; P}, P2, P3, P‘, premolars; M1,M2, 76) 
M:, molars. The eruption of the third incisor is not complete and 
the tooth is unworn. 
, 2, First and second permanent 
incisors; D7, third deciduous incisor. The | 
cheek teeth are numbered according to 
popular usage 
1 Other figures illustrating the teeth are to be found in the description of the skull. 
