幼若人胎児におけるアルカリ性フォスファターゼ分布の組織化学的研究

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  • 森 富
    Labor. of Assist. Prof. T. MORI, Dept. of Anat., Tohoku Univ.

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タイトル別名
  • Histochemical Studies on the Distribution of Alkaline Phosphatase in the Early Human Embryos
  • I. Observations on Two Embryos in Early Somite Stage, STREETER's Horizon X
  • I. 体節初期, Streeter の Horizon X に該当する2胎芽についての観察

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Distribution of alkaline β-glycerophosphatase in two young human embryos of 5 and 8 somites was observed histochemically. In most part of these specimens, the highest activity of the enzyme was detected in neural groove, neural crests, integumentary ectoderm, otic plate, cloacal membrane, gut endoderm and primordial germ cells. In the mesoderm and the notochord, gradated activity of the enzyme was noticed which diminished in its intensity in a caudo-cranial direction. Probable significance of such a gradient of the enzymic activity was also discussed in this report. Sections through the tail region, on the other hand, showed intense and even staining throughout ectodermic, mesodermic and endodermic layers. The epithelial cells of amnion, yolk sac and chorion revealed only a faint or moderate reaction in their free surface, while the mesodermic layer of these fetal membranes showed no remarkable activity of the enzyme.

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