. The anatomy of the horse, a dissection guide. Horses. DISSECTION OF THE ABDOMEN'. 319 from the rest of the intestinal mass. After the serous and muscular coats have been observed on the inflated caaoum, the bowel should be slit open on the convex side of its crook, the incision being extended to its point. The mucous surface is to be gently washed; and, in con- nection with its studj', the student is to examine the two orifices found on the concave side of the crook. Structure of the Large Intestine. Throughout nearly the^vhole of its length, the wall of the large bowel is made up of four co
. The anatomy of the horse, a dissection guide. Horses. DISSECTION OF THE ABDOMEN'. 319 from the rest of the intestinal mass. After the serous and muscular coats have been observed on the inflated caaoum, the bowel should be slit open on the convex side of its crook, the incision being extended to its point. The mucous surface is to be gently washed; and, in con- nection with its studj', the student is to examine the two orifices found on the concave side of the crook. Structure of the Large Intestine. Throughout nearly the^vhole of its length, the wall of the large bowel is made up of four coats, similar to those of the small intestine. 1. The Serous Goat is derived from the peritoneum, but it forms here a less complete investment than in the case of the small intestine, oon-. FlG. 42. Diagrammatic View (magnified) of a small Portion of the Mucous Membrane of the Colon {Allen Thomson). A small portion of the mucous membrane cut perpendicularly at the edges is shown in perspective ; on the surface are seen the orifices of the crypts of Lieberkiihn or tubular glands, the most of them lined by their columnar epithelium, a few divested of it aud thus appearing larger ; along the sides the tubular glands are seen more or less equally divided by the section ; these are resting on a wider portion of the submucous tissue, from which the blood-vessels are represented as passing into the spaces between the glands. siderable areas of the wall being without this covering. Thus, it is absent where the ceecum and double colon adhere to the pancreas and abdominal parietes in the sublumbar region; it is also absent where these two intestines adhere to each other, and where the parallel portions of the double colon come into contact; and lastly, as will be seen in the dissection of the pelvis, the terminal part of the rectum is without a peritoneal covering. 2. The Muscular Goat consists of two distinct layers—an external longi- tudinal and an internal circular. Throughout nearly
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecthorses, bookyear1902
