Human physiology . hosewhich line the crypts ofthe small bowel (Fig. 45). FIG. 45.—Glands of large intestine of rabbit. (Heklpn- Tills fact, noted by Heiden-a;res^aftereOPiOUSSeCreti0n0fm hain>S pupils, sllOWS that the glandular epithelium ofthe large intestine is more subject than that of the small bowel tomucosal changes during rest, and that during secretory activity themucus formed is excreted, and the primitive cells which predomi-nate in the small intestine are regenerated, by a new formation ofthe cytoplasm which surrounds the nucleus. Secretion of mucus(which is very useful in facil
Human physiology . hosewhich line the crypts ofthe small bowel (Fig. 45). FIG. 45.—Glands of large intestine of rabbit. (Heklpn- Tills fact, noted by Heiden-a;res^aftereOPiOUSSeCreti0n0fm hain>S pupils, sllOWS that the glandular epithelium ofthe large intestine is more subject than that of the small bowel tomucosal changes during rest, and that during secretory activity themucus formed is excreted, and the primitive cells which predomi-nate in the small intestine are regenerated, by a new formation ofthe cytoplasm which surrounds the nucleus. Secretion of mucus(which is very useful in facilitating the expulsion of the faecalmatters, which harden in the last part of the intestine byabsorption of water) thus seems to be the only well-ascertainedfunction of the secretory cells of the mucous coat of the largeintestine. XVII. Little definite is known as to the dependence of theintestinal secretion on the nervous system. According to Thiryand others, stimulation of the vagus produces no effect. According. ii EXTEENAL DIGESTIVE SECKETIONS 129 to Budge, extirpation of the caeliac plexus causes increase ofintestinal peristalsis, with increased secretion of succus results are more important (1868). After making anintestinal loop, he cut the mesenteric nerves which accompanythe vessels of the loop, and at once, or shortly after, saw an extra-ordinary amount of juice secreted in the loop, but not in thecontiguous parts of the intestine in which the nerves were excessive secretion may amount to T\ of the body-weight; itlasts for several hours, becomes less after 4 to 5 hours, and onlyceases after 24 hours. The secretion is at first a clear liquid,which presently becomes clouded with flocculi of mucus. Some-times it looks milky, and it contains large quantities of detachedepithelial cells. This enormous formation of intestinal juice (which has thesame properties as the normal secretion collected in the loop ofVella) is not explained by simple pa
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectphysiology, bookyear1
