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The ultrastructure of lymphatic valves in the adult rabbit lung

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Summary

An electron microscopic investigation has revealed that the pulmonary lymphatic valves of adult rabbits are not simple duplicatures of the lymphatic vessel wall. They consist of an uninterrupted central connective tissue core, covered on both sides with a single layer of flattened endothelial cells. Near their insertion in the lymphatic vessel wall, the connective tissue core reveals a distinct thickening being composed mainly of collagen bundles. In the other parts it contains mainly elastic fibers and fine filaments, enclosing also some rather peculiar connective tissue cells. Nervous and muscular elements were not observed. The endothelium is continuous and exhibits no open junctions. The valvular basement membrane is better developed than in lymphatic capillaries. The endothelial cells contain numerous cytoplasmic filaments which might be endowed with contractile properties. The nuclei of the endothelial and the connective tissue cells are irregularly spaced and frequently clustered near the free edge of the valve.

These ultrastructural features suggest that the function of the lymphatic valves is mainly passive. They are firmly inserted in the lymphatic vessel wall by collagen fibers and their moving parts are slender and elastic. Their endothelium appears relatively impermeable and is firmly attached to the subjacent connective tissue.

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Authors and Affiliations

  1. Department of Histology and Pathology, Katholieke Universiteit te Leuven, Leuven, Belgium

    Joseph M. Lauweryns & Luc Boussauw

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  1. Joseph M. Lauweryns
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  2. Luc Boussauw
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Additional information

This study has been supported by a grant from “The Council for Tobacco Research—U.S.A.”. We thank Professor Robert C. Rosan (Saint Louis University—U.S.A.) for expert advice, R. Janssens for technical, G. Pison and St. Ons for photographic and N. Tyberghien for secretarial assistance.

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Lauweryns, J.M., Boussauw, L. The ultrastructure of lymphatic valves in the adult rabbit lung. Z.Zellforsch 143, 149–168 (1973). https://doi.org/10.1007/BF00307476

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  • DOI: https://doi.org/10.1007/BF00307476

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