A manual of human physiology, including histology and microscopical anatomy, with special reference to the requirements of practical medicine . Fig. 127. a, Dental ridge; b, enamel-organwith 1, outer epithelium; 2,middle stellate layer; 3, ena-mel-prism cell layer ; c, den-tine-germ with blood-vesselsand the long osteoblasts outhe surface ; d, tooth - sac;e, secondary -Jt Fig. 128. a, Dental ridge; b, enamel-organ;c, dentine-germ ; /, enamel; g,dentine ; h, interval betweenenamel-organ and the position ofthe tooth; k, layer of odonto-blasts. or branches of these cells are left un
A manual of human physiology, including histology and microscopical anatomy, with special reference to the requirements of practical medicine . Fig. 127. a, Dental ridge; b, enamel-organwith 1, outer epithelium; 2,middle stellate layer; 3, ena-mel-prism cell layer ; c, den-tine-germ with blood-vesselsand the long osteoblasts outhe surface ; d, tooth - sac;e, secondary -Jt Fig. 128. a, Dental ridge; b, enamel-organ;c, dentine-germ ; /, enamel; g,dentine ; h, interval betweenenamel-organ and the position ofthe tooth; k, layer of odonto-blasts. or branches of these cells are left unaffected, and remain as the fibres of the same process occurs as in the formation of bone, the odontoblastsforming around themselves a calcified matrix. The cement is formed from the softconnective-tissue of the dental alveolus. Dentition.—During the development of the first (temporary or milk) teeth aspecial enamel-organ (Fig. 127, e) is formed near these, but it does not undergodevelopment until the milk-teeth are shed; even the papilla is wanting at the permanent tooth begins to develop, it opens into the alveolar wall of themilk-teeth from below. The tissue of this dental sac causes erosion, or eating away of the fang and evenof the body of the milk-teeth, without its blood-vessels undergoing atrophy. Thechief agents in the absorption are the
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectphysiology, bookyear1
