. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. 322 PHYSIOLOGY AND MORPHOLOGY OF ANIMALS. What we mean by saying that the intestines are outside of the peritoneal cavity is shown in Fig. Fig. 206.—Diagram showing the relation of the intestines to the abdominal cavity : z, intestine ; vc, visceral cavity ; per, peritonaeum ; m, muscular coat; ep, epithelial coat; sp, spinal column ; ao, aorta ; spc, spinal cord. (After Wiedersheim.) Coats of the Intestines.—Like the stomach, the intestines have three coats—the outer, perit
. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. 322 PHYSIOLOGY AND MORPHOLOGY OF ANIMALS. What we mean by saying that the intestines are outside of the peritoneal cavity is shown in Fig. Fig. 206.—Diagram showing the relation of the intestines to the abdominal cavity : z, intestine ; vc, visceral cavity ; per, peritonaeum ; m, muscular coat; ep, epithelial coat; sp, spinal column ; ao, aorta ; spc, spinal cord. (After Wiedersheim.) Coats of the Intestines.—Like the stomach, the intestines have three coats—the outer, peritoneal; the middle, muscular; and the inner, epithelial. In other words, it is a hollow, muscular tube, invested with the peritoneal coat and lined with epithelial or mucous mem- brane. The peritoneal coat gives smoothness, the mus- cular coat does the mechanical work, and the epithelial the chemical work of digestion. Mechanical Work.—The muscular coat consists mainly of two sheets of parallel fibers. In the outer one the fibers run lengthwise, in the inner ringwise. Under the contraction of these the intestines may be seen to squirm wormlike from side to side, and light waves of contraction may be seen running always in one direction—downward. This is the peristaltic action of the intestines. The waves must be light, otherwise. 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 LeConte, Joseph, 1823-1901. New York, D. Appleton and Company
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