Human physiology . Fio. 64.—Tracings of pyloric rhythm and its variations under the influence of progressive incre-ments of pressure. (Ducceschi.) At 1, the exploring balloon exerted very weak pressure onthe walls of the antrum; at 2, the pressure was increased by addition of 50 water ; at 3,4, 5, 6, 7, respectively, 50 water were added, by which the balloon became more and moredistended. On exciting the stomach by a sound with a rough surface,peristaltic movements are set up in the cardiac portion and fundus ;in the region of the pyloric antrum, on the contrary, the rhythm in DIGEST
Human physiology . Fio. 64.—Tracings of pyloric rhythm and its variations under the influence of progressive incre-ments of pressure. (Ducceschi.) At 1, the exploring balloon exerted very weak pressure onthe walls of the antrum; at 2, the pressure was increased by addition of 50 water ; at 3,4, 5, 6, 7, respectively, 50 water were added, by which the balloon became more and moredistended. On exciting the stomach by a sound with a rough surface,peristaltic movements are set up in the cardiac portion and fundus ;in the region of the pyloric antrum, on the contrary, the rhythm in DIGESTION IN THE MOUTH AND STOMACH 191 becomes disorganised, antiperistaltic waves occur, or there istetanic contraction of the walls (Figs. 65 and 66).. \f\J\ FIG. 65.—(Left.) Tracing 01 pyloric rhythm and its modifications under rapid mechanicalexcitation. (Ducceschi.) At A, the experimenter jerked the sound. Time tracing marks each5 sec. FIG. 66.—(Right.) Tracing from fundus of stomach. (Ducceschi.) At A, a marked increase ofmovement was obtained by rapidly shifting the sound. As regards the chemical stimuli that excite movements in thestomach, Briicke ascribes great importance to the acid content ofthe gastric juice, and proves that the movements are more or lessenergetic in proportion withthe digestive work. Accord-ing to Schiff, on the otherhand, chemical stimulationof the stomach is more par-ticularly due to copiousabsorption of the digestiveproduct (peptone), which issupported by the fact thattowards the end of digestionthere is constant reinforce-ment of the movements ofthe stomach. Ducceschi, to test theseviews experimentally, intro-duced 30-50 of 015 percent HC1 in the vicinity ofthe exploring balloon, and found tha
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectphysiology, bookyear1
