On the Surface of Developing Enamel in Elephas indicus

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  • インドゾウにみられる形成中の歯のエナメル質の表面について
  • インドゾウにみられる形成中の歯のエナメル質の表面について--古細胞生物学への試み
  • インドゾウ ニ ミラレル ケイセイチュウ ノ ワ ノ エナメルシツ ノ ヒョウ
  • 古細胞生物学への試み
  • a Proposal for Paleocytology

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Abstract

Tomes' process of the ameloblast plays an important role in the formation of the final shape of enamel prism. The chief pattern of the elephant enamel as observed by the horizontal section was similer to the maiden-hair frond (KOZAWA, 1974), and the section shows a round head facing the enamel surface and two winged processes directing to the dentino-enamel junction. For the purpose of discussing the ameloblast morphology of the fossil elephant, e.g. fossil mammoth (Elephas primigenius) and nauman-elephant (Paleoloxodon naumanni), etc, developing enamel surface from the tooth germ of indian elephant was offered to the present investigation, assuming the surface morphology of the developing enamel was the replica of the tip of Tomes' process. Most of the pits, which contained Tomes' process, were rectangle when obderved from the surface, while round or oval pits were also found. Pits were surrounded by wall-like ridges, which were supposed to be the interprismatic substance in the mature enamel. On the either edge of the short diameter of rectangular pits, a small depressions of bif treated tip of the ameloblast, which were comon to that forming maiden-hair prism. Round or oval pits were surmised to form the ameloblast, cross section of which revealed key-holes or arched appearance. As Tomes' process of Indian elephant teeth is bifurcated at the tip, the two dents are supposed to be impressions of the tip.

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