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Updated: April 30, 2025
Varieties of Epithelium. The squamous or pavement epithelium consists of very thin, flattened scales, usually with a small nucleus in the center. When the nucleus has disappeared, they become mere horny plates, easily detached. Such cells will be described as forming the outer layer of the skin, the lining of the mouth and the lower part of the nostrils.
Professor Schaaffhausen, who, with the other experienced zoologists, did not share these doubts, observed that the cranium, which included the frontal bone, both parietals, part of the squamous, and the upper third of the occipital, was of unusual size and thickness, the forehead narrow and very low, and the projection of the supra-orbital ridges enormously great.
The cancer cells retain the characters of squamous epithelium, and, being confined within the lymph spaces of the sub-epithelial connective tissue, become compressed and undergo a horny change. This results in the formation of concentrically laminated masses known as cell nests.
#Cancer.# There are several types of primary cancer of the skin, the most important being squamous epithelioma, rodent cancer, and melanotic cancer. [Illustration: FIG.
The bailiff, after examining the base of the tree, found the beginning of a hole beneath the bark; but he did not find the worm with the tough skin, shiny and squamous, covered with brown specks, ending in a tail not unlike that of a cockchafer, and having also the latter's head, antennae, and the two vigorous hooks or shears with which the creature cuts into the wood.
Then there are the columnar cells, found in various parts of the intestines, in which they are closely arranged side by side. These cells sometimes have on the free surface delicate prolongations called cilia. There are besides cells known as spindle, stellate, squamous or pavement, and various other names suggested by their shapes. Cells are also described as to their contents.
The varieties of cancer are distinguished according to the character and arrangement of the epithelial cells. The squamous epithelial cancer or epithelioma originates from a surface covered by squamous epithelium, such as the skin, or the mucous membrane of the mouth, gullet, or larynx.
It includes almost the whole of the frontal bone, both parietals, a small part of the squamous and the upper-third of the occipital. The recently fractured surfaces show that the skull was broken at the time of its disinterment. The cavity holds 16,876 grains of water, whence its cubical contents may be estimated at 57.64 inches, or 1033.24 cubic centimetres.
Lupus usually begins earlier in life, it presents apple-jelly nodules, and lacks the rounded, elevated border. Syphilitic lesions progress more rapidly, and also lack the characteristic margin. The differentiation from squamous epithelioma is of considerable importance, as the latter affection spreads more rapidly, involves the lymph glands early, and is much more dangerous to life. Treatment.
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