Human physiology : designed for colleges and the higher classes in schools and for general reading . very different character, called thecementum. It is not hard like the enamel. This arrangementis represented in Fig. 90. This is a tooth with two fangs orroots; 1, is the enamel; 3, the den- VJfl Qn tine or ivory: 2, and 7, the cement-um ; 4, an unnatural enlargement ofthe cementum, making an excres-cence ; 5, the cavity of the toothsupplied with bloodvessels and nerveswhich come through the channelsthat you see running up the middleof each fang. This cavity is analo-gous to that which is found
Human physiology : designed for colleges and the higher classes in schools and for general reading . very different character, called thecementum. It is not hard like the enamel. This arrangementis represented in Fig. 90. This is a tooth with two fangs orroots; 1, is the enamel; 3, the den- VJfl Qn tine or ivory: 2, and 7, the cement-um ; 4, an unnatural enlargement ofthe cementum, making an excres-cence ; 5, the cavity of the toothsupplied with bloodvessels and nerveswhich come through the channelsthat you see running up the middleof each fang. This cavity is analo-gous to that which is found in theshafts of the long bones as seen inFig. 83. The ivory and the cement-um are seen by the microscope to bevery different textures. The ivoryis traversed by innumerable branch-ing tubes running from within out-ward towards the cementum, asrepresented in Fig. 91. This is asection of a small portion of thedentine and cementum in the fang of a tooth, very much mag-nified, a, a, being the dentine, and c, c, the cementum, evidentlya different structure. The structure of the enamel as exhibited16. VerticalSECTION OF A TOOTH. 182 HUMAN PHYSIOLOGY. How teeth nre different from bones, and why.
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