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The fine structure of the endocardial endothelium

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Summary

The fine structure of the endocardium of the rat was studied at the level of the papillary muscles. In accordance with what is already known about endothelial cells of blood vessels, the occurrence of numerous vesicles underlying the plasma membrane was observed, indicating the pinocytotic activity of the endocardial endothelial cells.

The plasma membrane, as in all other cells, consists of two electron-dense layers separated by a light interspace. However, after phosphotungstic acid staining, it appears as a thickened single band at the free cell surface. This characteristic feature decreases towards the lateral cell boundaries. Intensely stained are also clumps of material pinched off from the plasma membrane and released into the cavity.

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Authors and Affiliations

  1. Department of Anatomy of the University, Kiel

    Luigi Candiollo

  2. Department of Anatomy of the University Torino, Corso M. D'Azeglio, 52, Italy

    Luigi Candiollo

Authors
  1. Luigi Candiollo
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Additional information

Assistant at the Department of Anatomy of the University, Torino, Italy (Dir.: Prof. F. Loretti). The author was awarded a grant from the Italian Consiglio Nazionale delle Ricerche for the present investigation.

The author wishes to thank Mrs. Behrens and Miss Anhut for excellent technical assistance.

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Candiollo, L. The fine structure of the endocardial endothelium. Zeitschrift für Zellforschung 61, 486–492 (1963). https://doi.org/10.1007/BF00407001

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  • DOI: https://doi.org/10.1007/BF00407001

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