RECENT electron microscopic investigations have demonstrated the peculiar relation between endocrine cells and capillary blood vessels. The cell plasma membrane of the former is not directly in contact with the endothelium of the latter: there is a perivascular space between both. These peri-capillary spaces were first described by Lever1 in ultra-thin sections of the adrenal cortex and medulla. The same subendothelial space is also found in the thyroid and parathyroid2 and in the corpus luteum3. It was observed by Green and van Breemen4 in the adeno-hypophysis.
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Lever, J. D., Amer. J. Anat., 97, 409 (1955).
Lever, J. D., J. Biophys. and Biochem. Cytol., 2/4, 2, Supp. 293 (1956).
Lever, J. D., Anat. Rec., 124, 111 (1956).
Green, J. D., and van Breemen, V. L., Amer. J. Anat., 97, 177 (1955).
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DE GROODT, M., LAGASSE, A. & SEBRUYNS, M. Subendothelial Space between the Ovarian Interstitial Cell and the Endothelial Lining of the Blood Sinusoids. Nature 180, 1431–1432 (1957). https://doi.org/10.1038/1801431a0
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