電子顕微鏡による蛙網膜の明, 暗順応の比較研究

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概要

• 論文の詳細を見る

• The fine structure of the retina of Rana nigromaculata, especially concerning pigment epithelial cells and visual cells in light and dark adaptation was studied with electron microscope and the following results were obtained. I. Pigment epithelial cell. 1) Mitochondria, half moon type myeloid bodies, spherical myeloid bodies and lipochrin and observed in the cytoplasm of the pigment epithelial cell. Some transitional froms between mitochondria and myeloid bodies are suggestive of the origin of these organella. Their distribution is different according to light and dark adaptation. In light adaptation they are mainly distributed in the middle and the basal area, while, in dark adaptation they are increased in the peripheral area towards terminal bar as well as in the basal area of the cell. 2) In dark adaptation there are abserved the appearance of many vesicles in the cytoplasm and the partial vacuolization of lipochrine. 3) In light adaptation pigment granules are almost located in the cytoplasmic processes. In dark adaptation, however, pigment granules come back to the basal area of the pigment epithelial cell. II. Visual cell. 1) In light adaptation, the lamellar structures are observed in the outer segment of rod. Each lamella is surrounded by an electron dense membrane of 40Å in thickness, having an inner layer of 60Å in thickness composed of lipid. This lamellar structure is changed to a "network structure" in darkness, especially in the central region of outer segment. 2) Myoid extends and has numerous vesicles in light adaptation. In dark adaptation, however, myoid shortens with a few vesicles. 3) The fine structures of extensive cone, extensive small cone and double cone are observed. There is no difference in the lamellar structure of the outer segment of cone between the light and the dark adaptation. 4) The extension of myoid in dark adaptation is especially remarkable in the extensive cone and the chief cone. 5) Glycogen granules are observed in the paraboloid of the accessory cone. In number and form of the granules, one can detect no difference between light and dark adaptation.

• 社団法人日本動物学会の論文
• 1962-04-15

著者

• 田中 昭

  阪大・理・生

• 田中 昭

  大阪大学医学部大学院中央研究室

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• 鳥類眼球の櫛膜の電子顕微鏡的研究I
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