. A text-book in general physiology and anatomy. Physiology, Comparative; Anatomy. 120 DIGESTION The serous coat is formed of the fold of the mesentery. The muscular coat is in two layers, an outer one of longi- tudinal fibers and an inner of circular fibers. The submucous coat of coimective tissue binds together the muscle and mucous membrane layers just as in the stomach, and receives the blood vessels which enter in a fold of the mesentery. The mu- cous coat which lines the whole intestine is pink, soft, and filled with minute vessels of the blood and lym- phatic system. In the upper part o
. A text-book in general physiology and anatomy. Physiology, Comparative; Anatomy. 120 DIGESTION The serous coat is formed of the fold of the mesentery. The muscular coat is in two layers, an outer one of longi- tudinal fibers and an inner of circular fibers. The submucous coat of coimective tissue binds together the muscle and mucous membrane layers just as in the stomach, and receives the blood vessels which enter in a fold of the mesentery. The mu- cous coat which lines the whole intestine is pink, soft, and filled with minute vessels of the blood and lym- phatic system. In the upper part of the in- testine it is perma- nently folded into ridges known as the Frs. 40-Wall of small intestine; a, 6, mucous i}alvulm COimiventeS, membrane with projecting villi; c, eZ, connec- i • -i • tive tissue layers (submucosa); e, circular WUlCU increase tnC muscle fibers; eMongitudinal muscle fibers; digestive SUrfaCe and /, serous membrane; g, spaces between villi; ° ft, opening of crypis or simple intestinal glands; delay the paSSage of i, blood vessels in villi. ,, „ , ,. , -^ the food particles. In the lower part these ridges disappear, and to the eye it appears smooth. Examined carefully with a lens the entire inner surface of the intestine is seen to be raised in minute projections called villi, like the pile of 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 Eddy, Walter Hollis, b. 1877. New York, Cincinnati [etc. ] American book Co
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