The exterior of the horse . Fig. 303.—/D. Table of inferiorright molar. SG. Table of fric-tion of a superior left molar. thicker in the tract of twotransverse lines which passthrough the middle part ofthe branches of the S, andit is at the points corre-sponding to these that theystand slightly in reliefabove the other points. Inthe inferior molars, it is theparietes of the infundibulawhich possesses the leastthickness (Fig. 303, ID). However it may be,the enamel layer is alwaysrelatively rather thin, andundergoes no modificationsunder the influence of agewhen once the teeth haveacquired their
The exterior of the horse . Fig. 303.—/D. Table of inferiorright molar. SG. Table of fric-tion of a superior left molar. thicker in the tract of twotransverse lines which passthrough the middle part ofthe branches of the S, andit is at the points corre-sponding to these that theystand slightly in reliefabove the other points. Inthe inferior molars, it is theparietes of the infundibulawhich possesses the leastthickness (Fig. 303, ID). However it may be,the enamel layer is alwaysrelatively rather thin, andundergoes no modificationsunder the influence of agewhen once the teeth haveacquired their full Fig. 304.—Inferior left molar arcade of a very old horse, show-ing the radical cementation of the middle teeth. A, A, A, vestiges of the roots ; B, B, B, radical cement. Theenamel has disappeared. THE MOLARS. 635 b. The ivory or dentine is deposited little by little upon the internal face ofthe enamel, and soon fills, from the crown to the roots, the diverticula of the pulpcavity. At first covered by the enamel, it soon becomes, under the influence ofwear, an integral part of the dental table. It is seen, in the superior molars, tosurround the periphery of the two infundibula and to constitute the basis of the 5iwhich their table resembles ; upon many of these teeth this comparison is so exactthat it is outlined by brown lines, sometimes very dark. In the inferior molars,the dentine is found, so to speak, only upon the outer side of the infundibula ;its central parts also have a brown coloration in a large number of subjects. c. The cement is extremely abundant ujjon the molars. It
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Keywords: ., bookcentury1800, bookdecade1890, booksubjecthorses, bookyear1892
