両生類の卵形成過程の研究 : II.ウシガエルの卵黄形成

概要

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Electron microscopic studies have shown that there is a dual mechanism for the formation of proteinaceous yolk in the bullfrog. In the first mode of formation, crystalline yolk begins to appear within the vesicular structures enclosing varying amounts of membranous, granular, and vesicular components in the peripheral cytoplasm of oocytes 200-250μ in diameter. Regarding the origin of membranous structures enclosed within yolk precursor bodies, it is presumed that they originate as a result of coalescence of vesicular structures including pinocytotic vesicles. In the second mode of formation, plate-like, hexagonally shaped yolk bodies originate within the mitochondria. Usually, their initial appearance is near the end of a filamentous mitochondrion and between the membranes of a single crista. These crystalline yolk bodies grow and elongate enormously within cristae, approximately perpendicular to the long axis of the mitochondrion and therefore the yolk containing part becomes pinched off sooner or later from the main body of the mitochondrion, Fatty yolk is found to be formed by the secretion of lipid through a break in the membrane of mitochondria.
社団法人日本動物学会の論文
1966-07-15