Elements of histology / by E. Klein.

  • Klein, E. (Edward) 1844-1925.
Date:
1889
Catalogue details

Licence: Public Domain Mark

Credit: Elements of histology / by E. Klein. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

    47/396 (page 27)
    CHAPTER IV. ENDOTHELIUM. .30. The free surfaces of tlie serous and synovia] membranes, and of those of the brain and sjoinal cord, the posterior surface of the cornea and anterior surface of the iris, the surfaces of tendon and tendon- sheaths, the lymph sinuses or lymph sacs of amphibian animals, the cavity of the heart, of blood-vessels and of lymphatic-vessels are lined with a continuous endothelial membrane, composed of a single layer of flattened trans- parent S(jua)nov.s cells, called endo- thelial cells (Fig. 20). Each contains an oval nucleus, situated as a rule excentrically. Just as in the case of epithelium, the endothelial cell plates are joined by a fluid or semi- fluid homofceneous interstitial or cement substance of the nature of globulin. When examining any of the above structures fresh, the endothelial cells are not, as a rule, visible, owing to their great trans- parency : but by staining the structures with a dilute solution of nitrate of silver, and then ex- posing them to the influence of the light, the cement substance appears stained black, whereby the shape and size of the cell plates become evident. By various dyes also the nucleus of each cell plate may be brought into view. On careful examination, and with suitable re- agents, it can be shown that each endothelial cell consists of a homogeneous ground-2)late. In it The nutliiiea of the eiulo- theli.il cells, iiiul the uucleus of the latter are well 8lu)\vu.