Atlas and epitome of human histology and microscopic anatomy / by Johannes Sobotta ; edited, with extensive additions, by G. Carl Huber.

  • Sobotta Johannes, 1869-1945.
Date:
1903
Catalogue details

Licence: In copyright

Credit: Atlas and epitome of human histology and microscopic anatomy / by Johannes Sobotta ; edited, with extensive additions, by G. Carl Huber. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    origin, tlie former probably only partially so, the striated musele-tibers arising from epithelial cells, while the smooth muscle-fibers are probably without exception of mesen- chymal orimn. It is customary, thei’efore, to i-ecognizc in the fully deyeloped human body four tyjies of tissues : (1) Tlie epithelial tissues; (2) the supporting tissues or the con- uectiye tissues ; (3) the muscular tissues ; (4) the ueryous tissues. EPITHELIAL TISSUE. Epitlielial tissues consist of clearly defined, regularly arranged cells, which clearly show fheir cellular nature and which are separated by yery small amounts of inter- cellular sul)stance. Aside from the occasional cuticular formations, they giye origin to no other secondary constit- uents, and especially not to fibrous elements. J'Jjntlielial ti'isue coyers the whole surface of tlie body and all mucous membranes and forms the essential jior- tion of all glands of the body. According to the form of the elements, we distinguish sfpiamous, cubic, cyliiidric, pyramidal or ])risniatic, and irregular epithelial cells ; epithelial cells which haye cilia a^-e designated as ciliated (‘jiithelial cells, independently of the form of the cells. Epithelial cells may be arranged in a single layer or in seyeral layers, so that we distinguish simj)le and stratified e])ithelium. We also distinguish a condition in which the main jiortion of the cells with the nuclei lie in different planes, while (ine processc's or thin- ner portions of the cells extend to the superficial surface as well as to th(> base of the epithelium ; such epithelium is known as pseiido-stratified, and it is often dillieult to determine whether we haye stratified epithelium or one presenting seyeral rows of nuelei. According to the form and arrangi'iiumt of the epithelial cells, we distinguish different tyjies of epithelia. In the human body the following types arc recognized ;