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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![increases the tenacity M'ith which the cell-remains adhere to each other when they become hardened and toughened on the surface of the epithelial layer (Fig. 39). These delicate bridges connecting neighboring cells are not pecu- liar to stratified epithelium, though they are more conspicuous in that tissue than elsewhere. They have been observed between the cells of the columnar epithelium of the intestinal mucous mem- brane, and also between the cells of other elementary tissues; e. g., smooth muscular tissue. 6. Transitional Epithelium (Figs. 40 and 41).—This variety re- sembles stratified epithelium in forming layers several cells in thick- FiG. 39. =4 I f] ^ Prickle cells from human stratified epithelium. (Rabl.) Four cells with delicate processes unit- ing across an intervening space are represented. The lower right-hand cell is just below the upper surface of the section, so that its surface is seen. This is covered with minute spots, which are end views of the prickles directed toward the observer. The nucleus of this cell is not in sharp focus, a fact indicated by the fainter outline in the figure. ness, but differs in the character of its superficial cells. These do not undergo the horny change peculiar to stratified epithelium, but con- tinue to increase in size, forming a covering of very large cells lying upon those beneath. Under these largest superficial cells are pyri- form cells lying with their larger, rounded ends next to the topmost layer, while their deeper and more attenuated ends lie between the oval or round cells that form the one or two deepest layers of the epithelium and rest upon the underlying tissues. Transitional epithelium is found lining the renal pelves, ureters, and bladder. Its structure permits of a considerable stretching of the tissues beneath without rupture of the epithelial layer over them, the cells of which become flattened to cover the increased surface, to return to their first condition when the viscus which they Jine is emptied. This is notably the case in the bladder, the epi-](https://iiif.wellcomecollection.org/image/b21223841_0052.jp2/full/800%2C/0/default.jpg)
