The anatomy of the lymphatic system.

  • Klein, Emmanuel E.
Date:
1873
Catalogue details

Licence: Public Domain Mark

Credit: The anatomy of the lymphatic system. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    of the cell; the cell possesses in some cases a more or less distinct constriction between the two nuclei, and the cilia of the surface have become very delicate and short. Finally, there may be seen endothelial cells without cilia, which consist of two nearly spherical portions held together by a short neck; each portion possesses a spherical, sharp-outlined nucleus, with clear contents and a shining nucleolus. Mr. Francis Darwin showed to me a preparation of the mesogas- trium of Rana temporaria, where there were to be seen germinating endothelial ceUs that perform distinct amoeboid movements. Fig. 52 shows such young endothelial cells, which bud from a freely-projecting knob ; the cells are in ameeboid movement. A similar, but not quite so abundant, germination may be observed on the peritoneal surface of the septum cisterns lymphaticae magnae of the frog, especially on the endothelial cells which smround, or more correctly speaking, which line the stomata first described by Dogiel and Schweigger-Seidel. These authors fomid on the peritoneal surface of the septum of female frogs, dming the spawning season, ciliated endothelial cells of a nearly cylindrical shape, in small groups near the stomata. I shall turn to the stomata afterwards. At present I wish only to mention that during the winter months, in some septa besides the germinating mostly ciliated endothelial cells, there exist shorter or longer tracts, which project more or less freely on the peritoneal surface, and which are covered with polyhedral, sometimes ciliated endothelial cells. Ludwig and Schweigger-Seidel first called attention to the differ- ence which exists as regards the endothelium of different portions of the peritoneal surface of the centrum tendineum of the diaphragm of rabbits. These authors have shown that the endothelial cells, which are situated over the straight lymphatic channels, between the tendon bundles, are of a smaller size than the endothelial ceUs which lie over the tendon bimdles themselves. They assert also that there exist sometimes groups of lymphoid corpuscles, which are continuous with, or properly speaking, derived from, those stripes of small endothelial cells previously mentioned. I am able not only to confirm this latter observation, but also to