. A text-book on physiology : for the use of schools and colleges : being an abridgment of the author's larger work on human physiology. bres of the third layer take, for the most part, an ob-lique direction. The interior or mucous coat is some-times termed the villous, from its velvety color is very variable; it is folded into rugae, admit-ting of variations in the distention of the stomach, with-out interference with the structure or functions of themembranes of which they are a part. The cardiac ori-fice is plicated, and the opening into the duodenum isthrough a circular fold
. A text-book on physiology : for the use of schools and colleges : being an abridgment of the author's larger work on human physiology. bres of the third layer take, for the most part, an ob-lique direction. The interior or mucous coat is some-times termed the villous, from its velvety color is very variable; it is folded into rugae, admit-ting of variations in the distention of the stomach, with-out interference with the structure or functions of themembranes of which they are a part. The cardiac ori-fice is plicated, and the opening into the duodenum isthrough a circular fold with a central aperture—the py-loric valve, which being surrounded with a band of mus-cular fibres acting as a sphincter, the passage from thestomach to the intestine may be entirely obstructed. The stomach is seen in section Fig. 3, a being theoesophagus; 5, the greater extremity; c, the smallercurvature; c7, the great curvature; e, the pyloric or lessend; f, A, the duodenum; g, place of entry of the duc- What is the general shape of the stomach? How many coats hasit ? Describe each of them. Describe the parts shown in Fig. 35 Section of the human stomach showing its mucous interior. tus communis choledochus and pancreatic duct. Theplace of junction of the oesophagus is the cardiac region:the membrane is there plicated. The place of junctionof the duodenum is the pyloric region. The typical form of the digestive apparatus is a sacwith one aperture, serving the double purpose of afford-ing an entrance to nutritive material, and an outlet toundigested remains. In a higher condition it may beconceived of as a tube open at both ends, and having asac-like swelling on its middle part. The portion ofthe tube anterior to the sac is the type of the oesopha-gus, its aperture answering to the mouth, the sac-likeswelling being the type of the stomach, and the tubeleading from it representing the intestinal canal. Inthe more elementary of such forms, vessels arise fromthe walls of t
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Keywords: ., bookautho, bookcentury1800, bookdecade1860, booksubjectphysiology
