. The elements of pathological histology with special reference to practical methods . definite vege-table and animal parasites, or which, already fully formed, enter theintestine with the ingesta, or which act upon the intestinal mucousmembrane from the circulation ; while lastly, corrosive substances ina low degree of concentration, or mechanically irritant bodies, mayalso act in this w^ay. In acute catarrh of the intestine the finer changes in the mucousmembrane are like those in gastric catarrh, except that at one time CATARRH 239 mucous degeneration of the epithelium predominates, at anot
. The elements of pathological histology with special reference to practical methods . definite vege-table and animal parasites, or which, already fully formed, enter theintestine with the ingesta, or which act upon the intestinal mucousmembrane from the circulation ; while lastly, corrosive substances ina low degree of concentration, or mechanically irritant bodies, mayalso act in this w^ay. In acute catarrh of the intestine the finer changes in the mucousmembrane are like those in gastric catarrh, except that at one time CATARRH 239 mucous degeneration of the epithelium predominates, at anotherdesquamation, and at a third suppuration, , a greatly increasedemigration of colourless corpuscles; and the mucous layer upon thesurface shows a somewhat variable consistence and composition cor-responding to these differences. The accumulation of leucocytes inthe intertubular tissue of the mucous membrane may under certaincircumstances be so considerable that the Lieberkiihns glands arenot only pushed widely apart, but their uppermost segments are alsocompressed (Fig. 119).. Fig. 119.—Acute Catarrh of the Large Intestine. x 240. (Alum cochineal.)a, Pus corpuscles (with scanty fibrin ) on the surface of the mucous membrane,which is stripped of epithelium ; h. Small-celled infiltration of the mucous membrane ;c, Upper compressed segment of the Lieberkiihns glands, which are separated from eachother. Their eyiithelium is for the most part loosened from the meuibrana propria, andbetween the two a few pus-corpuscles are settled ; d, Submucosa. Similar conditions prevail in chronic catarrh. In it there sometimesensues, as a consequence of narrowing or occlusion of the orifices ofthe glands, a formation of numerous small retention cysts, which still,however, often show a fine aperture from which glassy mucus oozesout. In many cases of chronic catarrh a mucus appears to be secretedwhich is not only very copious but very viscid, and which then,should it lie for any l
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpatholo, bookyear1895
