Elements of animal physiology, chiefly human . Fig. 30. Fibres or Prisms of fibres, which stand endwise, side by side, perpendicu-larly to the surface of the tooth, or to the dentine. (Seefig. 30.)139. Dentine orvTooth Tissue constitutes the mass of Irregular Cavities in which Dental TubuU ^ ^,„ Terminate. Dental Cementum, Fig. 31. Transverse Section of Tooth at the Junction ofCementum and Dentine. the tooth. It consists of a modification of osseous tissue, containing, however, a much larger proportion of earthy matter (contains about 78 per cent.) than true bone. 68 ANIMAL
Elements of animal physiology, chiefly human . Fig. 30. Fibres or Prisms of fibres, which stand endwise, side by side, perpendicu-larly to the surface of the tooth, or to the dentine. (Seefig. 30.)139. Dentine orvTooth Tissue constitutes the mass of Irregular Cavities in which Dental TubuU ^ ^,„ Terminate. Dental Cementum, Fig. 31. Transverse Section of Tooth at the Junction ofCementum and Dentine. the tooth. It consists of a modification of osseous tissue, containing, however, a much larger proportion of earthy matter (contains about 78 per cent.) than true bone. 68 ANIMAL PHYSIOLOGY. When examined under tlie microscope, it is seen to consist of adense homogeneous substance [intertubular tissue), which is per-meated by an immense number of very minute wavy tubes (thedental tuhuU), which anastomose with each other. (See fig. 31.) 140. The Crusta Petrosa—cementum or cortical sub-stance—is the layer or crust of true bone, which,surrounds or covers the hidden portion of the toothfrom the neck to the end oi the faiig. (See fig. 31.) 141. Muscular Fibre.—The peculiar property of mus-cular fibre is its contractility, or power of sliortening,under the influence of the will or of nervous stimulus,or under that of chemical, mechanical, or electrical irri-tation. There are two kinds of muscular fi
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