牛胎児副腎皮質の組織学的研究竝びにLipid出現の時期について

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The present study was conducted to clarify the histological differentiation of the adrenal cortex of the bovine fetus and to determine the time when the sudanophilic lipid appears for the first time in the adrenal gland. Twenty bovine fetuses, from 13 to 43cm in C.R.L., collected at a slaughter house in Osaka were used in this study. Fixed with 10% formalin, one of the adrenals of each fetus was paraffin-sectioned at 7μ in thickness and stained by several methods; the other was frozen-secti ned at 25μ and stained with Sudan IV-hematoxylin. The observations are summarized as follows. At the stage of a 13-cm C. R. L., the cortical parenchyma was composed of irregular cell cords alone. At that of a 16-cm C.R.L., beneath the capsule were revealed rather slightly smalloepitheloid cells grouped in spherical clusters. A layer of these clusters of cells is to be termed zona glom-erulosa. By the stage of a 24-cm C. R. L., the spherical clusters beneath the capsule developed further and expanded horizontally along the capsule with widening connective tissue spaces among them. The cells of z. glomerulosa were smaller and stained darker than those of z. fasciculata. Histolo-gical differentiation of the adrenal cortex of the bovine fetus seemed to be almost completed essen-tially by the stage of a 30-cm C. R. L., because little changes were found in the gland after this stage. Few sudanophilic lipid droplets were found in the parenchyma of the adrenal cortex of a 19-cm-long fetus. In a 24-cm-long fetus, however, sudanophilic droplets were contained in some cortical rPlls, especially in the glomerular and the inner fasciculate cells in considerable abundance. From the stageof a 27-cm C. R. L., on all adrenals contained lipid droplets in the cortex with no exception. From the stage of a 27-cm C.R.L. on, lipid droplets gradually increased their size and number in the glomerular cells. As the lipid contained in the adrenocortical cellsis said to have an intimate relatiorship with hormone production, it may be concluded presumably from the above observations that the adrenal of the bovine fetus may shows in some manner the hormone-formation or the secretory activity, at least after the growth stage of a 27-cm C. R. L.
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牛胎児副腎皮質の組織学的研究竝びにLipid出現の時期について

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