ニワトリ胎児膵臓の組織発生の微細構造についての二三の知見

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  • 谷沢 義弘
    Department of Anatomy, Hiroshima University School of Medicine
  • 藤田 尚男
    Department of Anatomy, Hiroshima University School of Medicine

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タイトル別名
  • Some Observations on the Fine Structure of the Development of the Pancreas in the Chick Embryo
  • ニワトリ タイジ スイゾウ ノ ソシキ ハッセイ ノ ビサイ コウゾウ ニ ツイテ ノ ニ , サン ノ チケン エイブン

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Normal pancreas of White-Leghorn chick embryo, ranging in age from 6 to 20 days of incubation, was observed with the electron microscope.<br>1) The pancreas of 6-9 day-old embryos consists mainly of accumulates of immature glandular cells which are located at the terminal portions of the duct system. The immature glandular cell is characterized by numerous polysomes and few cytomembranes. A small number of round, dense granules presumably of the zymogen or prozymogen substances appear in rare cells at 6 days.<br>2) The acinar cells containing zymogen granules, and the granules contained in each cell are increased markedly in number at 12 days. The development of the rough-surfaced endoplasmic reticulum is closely related to this increase in the amount of the zymogen granules in the cell.<br>3) Endocrine cells, presumably A-cells, appear sporadically among the immature cell masses at 6 days of incubation.<br>4) The centro acinar cell begins to be noticed in the exocrine part of the gland at 15 days. This cell is characterized by a light cytoplasm without secretory granules. It becomes easy to distinguish the acinar cell and the centro-acinar cell at 17 days.<br>5) The occurrence of the physiologic degeneration of a few immature or a few differentiated acinar cells in the embryonic stage is reported and discussed.

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