Elements of histology / by E. Klein.

  • Edward Emanuel Klein
Date:
1884
Catalogue details

Licence: Public Domain Mark

Credit: Elements of histology / by E. Klein. Source: Wellcome Collection.

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    part facing a cavity, canal, or general surface—in many instances a bright thinner or thicker cuticular struc- ture is seen, with more or less distinct vertical striation. The conical or spindle-shaped, club-shaped, and pear- shaped cells are drawn out into longer or shorter single or branched extremities. The squamous or pavement cells are cubical, polyhedral or scaly. The nucleus of the former is almost spherical that of the latter flattened in propor- tion to the thinness of the scales. In polyhedral cells it can be occasionally perceived that the granula- tion is due to the regular honeycombed nature of the cell protoplasm. 19. As regards size, the epithelial cells differ considerably from one another in different parts, and even in the same part. Thus, the columnar cells, Fig. 13b.—Three Miicus-secretiDg- ducts of the kidney are surface of the cornea are considerably smaller than those on the surface of the lining membrane of the urinary bladder; the scales lining the ultimate recesses of the bronchial tubes—the air cells—are considerably smaller than those on the surface of the membrane lining the human oral cavity and oesophagus. 20. As regards arrang-ememt, the epithelial cells are either arranged as a single layer or are stratified, forming several superposed layers; in the former case G covering the surface of the villi of the small in- testine, are considerably longer than those lining the mucous membrane of the uterus; the columnar cells lining the larger A, From the stomach of newt; b, from a mucous gland ; c, f rom the surface of the mucous membrane of the in testine. considerably longer than those lining the small ducts; the polyhedral cells covering the anterior