Histology; normal and morbid.
- Dunham, Edward K. (Edward Kellogg), 1860-1922
- Date:
- 1898
Licence: Public Domain Mark
Credit: Histology; normal and morbid. Source: Wellcome Collection.
Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.
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![thclial lining; of the serous cavities (Fig. 24). These openings are called stomata and furnish a direct communication between the se- rous cavities and the lymphatic spaces in the tissues surrounding them. These openings virtually convert the serous cavities into enormous lymph-spaces forming a part of the general lymphatic system. Fig. 23. Mesentery of frog treated with silver nitrate. The mesentery is covered on both surfaces with a layer of endothelium. Between these is areolar connective tissue containing bloodvessels, lymphatics, and nerves. In this figure only the two endothelial layers and a capillary bloodvessel are represented: o, nucleus of endothelial cell belonging to upper- most layer; b, nucleus of cell belonging to deep layer forming the lower surface of the specimen; c, intercellular cement between cells of upper layer of endothelium ; d, d, nuclei f)f endothelial cells, forming a capillary bloodvessel, seen in profile. The bodies of these cells are not reproduced in the figure. The cement in the deep layer of endothe- lium is represented by finer linos to distinguish it from that belonging to the upper layer. The edges of contiguous endothelial cells are not everywhere in equally clo.se approximation to each other (Fig. 25). The occasional points whore they are more widely separated than usual are occu- pied either by an increased amount of the cement-substance, or pro- cesses from cells in the underlying tissues are here intercalated between the endothelial cells, reaching the surface of the serous membrane. In cither case th(!S(; points of separation of the endo- thcliiil cells are not o])enings through the tissue, though, as we shall see in a subsequent chapter, they are spots where the tissue is rela-](https://iiif.wellcomecollection.org/image/b21223841_0042.jp2/full/800%2C/0/default.jpg)
