Archive image from page 1212 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( STKUCTUKE OF THE INTESTINES. 1179 —an outer stratum longitudinale, in which the fibres run longitudinally, and an inner stratum circulare, in which they are circularly disposed. The muscular coat is thicker in the duodenum than in any other part of the small intestine, and it gradually diminishes in thickness until the end of the ileum is reached. On the other hand, in the large intestine, it is thickest in the rectum and thinner towards the beginning
Archive image from page 1212 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( STKUCTUKE OF THE INTESTINES. 1179 —an outer stratum longitudinale, in which the fibres run longitudinally, and an inner stratum circulare, in which they are circularly disposed. The muscular coat is thicker in the duodenum than in any other part of the small intestine, and it gradually diminishes in thickness until the end of the ileum is reached. On the other hand, in the large intestine, it is thickest in the rectum and thinner towards the beginning of the colon. The stratum longitudinale of this coat is much thinner than the underlying stratum circulare. In the small intestines it forms a complete sheet, continuous all round the gut (Fig. 928), but thickest at its free margin; whilst in the large intestine it is divided up into three longitudinal bands known as the tcenia? coli, which will be more fully described in connexion with the colon. The stratum circulare, much thicker than the longitudinal layer, is composed of bundles of muscular fibres arranged circularly round the tube (Fig. 929), and forming in all parts a continuous sheet. Unlike the longitudinal fibres, those of the circular layer take part in the formation of the valves of the pylorus and colon. 3. Tela Sllbmucosa.—-This is a loose but strong layer of areolar tissue connecting the muscular and mucous coats, on which chiefly depends the strength of the intestinal wall. In addition to forming a bed in which the vessels break up before entering the mucous coat, it contains the glandulce duodenales (Brunneri) (Fig. 929), and, in both small and large intestines, the bases of the solitary lymph nodules lie in it (Fig. 929). 4. Tunica Mucosa.—The mucous membrane constitutes the inner coat of the intestine. It is everywhere composed (Fig. 929) of the following parts :—(1) A layer of striated, columnar, epithelial cells, resting on (2) a basement membrane.
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