Elements of histology (1898) Elements of histology elementsofhistol00klei Year: 1898 40 CHAPTER lY ENDOTHELIUM. 30. The free surfaces of the serous and synovial membranes, and of those of the brain and spinal 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- jjarent squamous cells, called endo- thelial cel
Elements of histology (1898) Elements of histology elementsofhistol00klei Year: 1898 40 CHAPTER lY ENDOTHELIUM. 30. The free surfaces of the serous and synovial membranes, and of those of the brain and spinal 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- jjarent squamous cells, called endo- thelial cells (Fig. 28). Each contains an oval nucleus, situated as a rule excentrically. Just as in Fig 28-Endothelium the case of epithelium, ' the endo- of the Mesentery of â ,â ,â¢â > n i â ⢠Cat. thelial cell plates are joined by a The outlines of the endo- fluid or semi-fluid liomoifeneous in- thehal cells and tlie ⢠⢠7 7 nucleus of the latter terstitiat or Cement substance or the are well shown. â , , ,. nature oi globulin. \\ hen examin- ing any of the above structures fresh, the endothelial cells are not, as a rule, visible, owing to their great transparency; but by staining the structures with a dilute solution of nitrate of silver, and then exposing them to the influence of the light, the cement sub- stance appears stained black, whereby the shape and size of the cell plates become e^â ident. 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
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