. The physiology of digestion : considered with relation to the principles of dietetics . the whole intestines, which facilitates their action,but which could not take place unless they were capa-ble of gliding easily and freely over each other. Theperitoneal coat, being strong, extensible, and elastic, isvery useful also as a support to the other coats. The peritoneal coat, after forming the outer cover-ing of the intestine, represented by the dotted lineround the circle Tin the figure on next page, is contin-ued from it in the form of a double membrane (repre-sented by the two dotted lines)
. The physiology of digestion : considered with relation to the principles of dietetics . the whole intestines, which facilitates their action,but which could not take place unless they were capa-ble of gliding easily and freely over each other. Theperitoneal coat, being strong, extensible, and elastic, isvery useful also as a support to the other coats. The peritoneal coat, after forming the outer cover-ing of the intestine, represented by the dotted lineround the circle Tin the figure on next page, is contin-ued from it in the form of a double membrane (repre-sented by the two dotted lines) towards the spine S, towhich it is first firmly attached by cellular substance ;after which the folds again separate, each being con-tinued or reflected, as it is called, over the whole innersubstance of the cavity of the abdomen in the courseshown by the dotted line, the figure itself representing 148 INTESTINE THE MESENTERY. a transverse section of the abdomen. By this arrange-ment two important objects are attained. First, the ab-dominal peritoneum A P forms a soft lubricated sur-. face, corresponding to that of the bowels themselves;and, secondly, a firm point of attachment for the bow-els is secured, by which they may be supported in theirproper places, and at the same time admit of somechange of position. The floating portion of the perito-neum M, by which the attachment is effected, is calledthe mesentery (from pstfog, mesos, the middle, and svrsgov,enter on, intestine.) But the intestinal canal being somuch longer than the portion of the spine to which themesentery is attached, the latter is necessarily disposedin folds, converging towards the spine, something likethe folds of a fan converging towards its narrow this way, the mesentery, besides serving as a sup-port to the gut, serves also to receive and afford pro-tection to the numerous vessels, nerves, and lacteals,which are copiously ramified on every portion, partic- INTESTINE THE MUSCULAR COAT. 149 ularly o
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