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The fine structure of the newborn rat adrenal cortex

II. Zona juxtamedullaris

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Summary

The structural changes of the zona juxtamedullaris of the rat adrenal cortex at birth, have been examined by the light and the electron microscope. In this zone clusters of medullary cells lying among the strands of cortical tissue were observed. In the inner portion of the zona juxtamedullaris two types of adrenocortical cells were found: light and very-dark cells. The latter are smaller than the light cells and are always in close connection with the medullary tissue. The ultrastructural features of the very-dark cells suggest that these elements are in degeneration. This finding supports the hypothesis that at birth there is a partial degeneration of the rat zona juxtamedullaris, i.e. the zone corresponding to the “fetal zone” of some mammalian species.

It is proposed that in all mammalian species at birth there is a partial regression of the zona juxtamedullaris and that the regression of the “fetal zone” is only the quantitative increase of this phenomenon. This hypothesis is discussed in relation to numerous data demonstrating that there are enzymatic conditions in the rat during fetal life, which permit a discrete hypertrophy of the adrenal cortex.

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Authors and Affiliations

  1. Department of Anatomy, Padua University, Laboratory of Electron Microscopy, Italy

    Gastone Giovanni Nussdorfer

  2. Istituto di Anatomia Umana normale, Università di Padova, Via A. Gabelli, 37, 35100, Padova, Italia

    Gastone Giovanni Nussdorfer

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  1. Gastone Giovanni Nussdorfer
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The author wishes to express his appreciation to Dr. A. Gambino and to Mr. G. Gottardo for technical assistance.

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Nussdorfer, G.G. The fine structure of the newborn rat adrenal cortex. Z. Zellforsch. 103, 398–409 (1970). https://doi.org/10.1007/BF00335282

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