. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 308 STOMACH AND INTESTINE. the trunk in which they are enclosed ; and it limits, permits, and facilitates those move- ments, which it is chiefly the office of the second to execute. The third is the most important, since it forms the complex secreting and ab- sorbing surface, upon which the functions of the canal mainly depend. Between these three tunics are interposed two layers of areolar tissue ; containing vessels, nerves, and lympha- tics for their supply. The various modifica- tions undergone by these constituents
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 308 STOMACH AND INTESTINE. the trunk in which they are enclosed ; and it limits, permits, and facilitates those move- ments, which it is chiefly the office of the second to execute. The third is the most important, since it forms the complex secreting and ab- sorbing surface, upon which the functions of the canal mainly depend. Between these three tunics are interposed two layers of areolar tissue ; containing vessels, nerves, and lympha- tics for their supply. The various modifica- tions undergone by these constituents of the tube, in the three segments just distinguished as the stomach, small intestine, and large in- testine, will form the chief features of the fol- lowing description. The STOMACH is the widest and most di- latable part of the alimentary canal. Its form varies greatly in different indivi- duals. Removed from the body, and mode- rately distended, it generally takes the shape represented in Jig. 240.*; — a shape which is often compared to that of a bagpipe, and may be best described as a bent cone, the concave aspect of which is joined by a tube at one- fourth of the distance from its base. In it we distinguish an anterior and a posterior surface; a superior and an inferior border; a right and a left extremity; together with the cardiac and pyloric apertures, by which it communicates with the oesophagus and duodenum respec- tively, and thus becomes continuous with the remaining portions of the digestive canal. The description of these different parts will vary, according to the full or empty state Fig. Stomach and duodenum. The tube has been everted and inflated, and its mucous membrane dissected off, so as to show the subjacent muscular coat. a g, cardiac orifice; b h, pyloric valve; a e b, lesser curvature, or upper border; g dfc Ii, greater curvature, or lower border. (The dotted lines joining a e, e b, and c h are intended to illustrate the mode in which extreme d
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