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.
48/466 page 52
![is no sharp structural line separating cubical from pavement-epithe- lium. Functionally, pavement-epithelium is a much less active tissue than the cubical variety. 3. Columnar Epithelium (Figs. 31, 32, 33).—The cells of this Fig. 81. Columnar epithelium. From tongue of pseudopus. (Seller.) a, three cells with intact cyto- plasm, except the central one, which contains a vacuole; 6, three cells of which the dis- tal ends contain drops of fluid (vacuoles) or of metaplasm. form of epithelium are of a general columnar or prismatic shape and possess a single nucleus and a cytoplasm that is usually dis- tinctly granular. They are arranged with their long axes parallel to each other, so that their free ends form the surface of the epithe- FiG. 32. Fig. 33. Columnar opitlielium. Fig. 32.—From small intestine of the mouse. (Paneth.) a, pyramidal reserve cell, nucleus not included in section ; h, gfjblet cell, enclosing a large drop of secretion. Fig. 33.—From small intestine of the mouse. (Paneth.) Columnar epithelial cells seen from above: h,goblet-cell, tlie mucous contents darkened by the hardening process; s, s,highly granular cells which have recently dischargei! their secretiDU. liuin, while their deeper ends either rest upon the tissues beneath the epithelium or njxm other epithelial cells of diflercMit shape which form one or more layers between tlic coliiiimar cells and the underlying tissues. Wlicn they rest directly upon the tissues beneath there arc usually other epithelial cells of a pyramidal or oval shape which may be regarded as immature cells ready to take the place of such fully developed cells as may become detached or destroyed. The ])re.<eiice of these cells occasions a narrowing of](https://iiif.wellcomecollection.org/image/b21223841_0048.jp2/full/800%2C/0/default.jpg)
