. The anatomy of the horse, a dissection guide. Horses. 340 THE ANATOMY OP THE 4. The Mucous Coat.—It is desirable to study this on the stomach of an animal recently killed. If possible, take such a stomach with about a foot of the duodenum and a few inches of the oesophagus attached, and fasten the duodenum to a tap. Let water flow into the organ, and it will be noticed that, even when the stomach is much distended, none of the water escapes by the orifice of the gullet, although that is unligatured. This is an instructive experiment, as showing the difficulty of vomition in the horse
. The anatomy of the horse, a dissection guide. Horses. 340 THE ANATOMY OP THE 4. The Mucous Coat.—It is desirable to study this on the stomach of an animal recently killed. If possible, take such a stomach with about a foot of the duodenum and a few inches of the oesophagus attached, and fasten the duodenum to a tap. Let water flow into the organ, and it will be noticed that, even when the stomach is much distended, none of the water escapes by the orifice of the gullet, although that is unligatured. This is an instructive experiment, as showing the difficulty of vomition in the horse. Now allow the contents of the stomach to escape by the duodenum ; and either evert the organ and inflate it, or incise it along its convex curvature. It will at once be noticed that the mucous lining is not the same throughout. The left or cardiac half of the cavity is lined by a mucous membrane termed cuticular; the right or pyloric half has a totally different lining, termed villous. The cuticular portion is pale, harsh, without true gastric glands, but possessed of a few mucous follicles, and covered on its free surface by a thick stratified squam- ous epithelium. It is, in fact, an ex- tension of the oesophageal mucous mem- brane, which it resembles in all respects. Towards the middle of the stomach it is separated from the villous half by an abrupt, raised, and slightly sinuous line of demarcation—the cuticular ridge. The villous half is rosy, soft, and velvety (but without villi), thickly beset with gastric glands, and possessed of a single layer of columnar epithelium. The gastric glands are of the tubular variety, and by the aid of a lens numbers of them may be seen opening together into pits, or alveoli, of the mucous membrane. The cuticular portion is but slightly vascular, but the villous portion is richly supplied with blood-vessels. In the collapsed organ the mucous membrane is thrown into folds, or j-ugw. The (Esophageal Orifice, it will now be seen, is very
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecthorses, bookyear1902
