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Development of the adrenal medullary cells in rats with reference to synaptogenesis

Cell and Tissue Research volume 179, pages 77–86 (1977)Cite this article

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Summary

The adrenal medullae of rats were studied electron microscopically from day 13.5 of gestation. Synapses with thickening of pre- and post-synaptic membranes were first evidenced on the medullary cells of 15.5-day-old fetuses. They increased gradually in number with advancing age. In the medullary cells, a few membrane-limited granules were recognized on day 13.5 of gestation, and thereafter they increased in number. The appearance of the granules was not uniform; some of the granular contents consisted of fine or coarse particles and others contained homogeneous material of varying electron-densities. The population of these granules in the cytoplasm was different from cell to cell. Thus, the discrimination of cell types (NA- and A-cells) was not possible in the prenatal period. Granular discharge of the cells was totally absent in the normal untreated fetuses. However, upon the intraperitoneal administration of insulin to the fetus on day 16.5, 18.5, or 21.5 of gestation, granular discharge by reverse pinocytosis was first evidenced in the medullary cells of the 21.5-dayold fetus.

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Affiliations

  1. Department of Anatomy, School of Medicine, Tokushima University, Tokushima, Japan

    Shigeo Daikoku, Masae Kinutani & Masaharu Sako

Authors
  1. Shigeo Daikoku
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  2. Masae Kinutani
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  3. Masaharu Sako
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Daikoku, S., Kinutani, M. & Sako, M. Development of the adrenal medullary cells in rats with reference to synaptogenesis. Cell Tissue Res. 179, 77–86 (1977). https://doi.org/10.1007/BF00278463

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Key words

  • Adrenal medulla
  • Synaptogenesis
  • Exocytosis