. Comparative anatomy. Anatomy, Comparative. THE DIGESTIVE SYSTEM 315 adult. The walls of the large intestine are sacculated, and they bear externally numerous fatty appendages, the appendices epiploicae. The longitudinal muscles do not form a continuous layer as in the small intestine, but are arranged in three longitudinal bands, the teniae. Trans- verse crescentic folds, the plicae semilunares, are abundant. Between these the wall of the colon bulges out to form haustra. The large intestine is divided into cecum, vermiform appendix, colon, rectum, and anus. The cecum is a bUnd sac, about tw
. Comparative anatomy. Anatomy, Comparative. THE DIGESTIVE SYSTEM 315 adult. The walls of the large intestine are sacculated, and they bear externally numerous fatty appendages, the appendices epiploicae. The longitudinal muscles do not form a continuous layer as in the small intestine, but are arranged in three longitudinal bands, the teniae. Trans- verse crescentic folds, the plicae semilunares, are abundant. Between these the wall of the colon bulges out to form haustra. The large intestine is divided into cecum, vermiform appendix, colon, rectum, and anus. The cecum is a bUnd sac, about two and a half inches Glands. ?. Muscularis mucosa. Submu- cosa. Solitary nodule with germinal center. —Vertical section of the mucous membrane of the descending colon of an adult man. The fat has been blackened with osmic acid. (From Bremer's "Text Book of ;) Fat cells. Fig. 264. in length, lying near the ileocolic valve in the right iUac fossa. The vermiform appendix of the cecum is an elongated worm-shaped tube between three and four inches in length, attached to the apex of the cecum. The structure of the appendix is similar to that of the large intestine in having numerous Lieberkuehn's glands and lymph nodules. In the majority of persons, the lumen becomes occluded in later life. The appendix appears to be a rudiment of a more extended cecum functional in the ancestors of man. The colon is divided into four regions, ascending, transverse, descending and sigmoid colon. The ascending colon passes up the right side of the abdominal cavity as far as the liver, where it bends to the left. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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