. Roentgen interpretation; a manual for students and practitioners . Fig. 134.—Normal stomach deformed by pressure. Plate taken \Yith patient prone. Normal peristalsis begins at about the middle of the lesser curva-ture with a shallow depression corresponding to it on the greatercurvature. The wa\es tra^el toward the pylorus without inter-ruption. They become progressively deeper as they pass forwardand may bisect the barium mass at the upper limits of the the pylorus opens, the antrum then contracts as a whole, forcingits contents into the duodenum. If not, the waves move on to STOM
. Roentgen interpretation; a manual for students and practitioners . Fig. 134.—Normal stomach deformed by pressure. Plate taken \Yith patient prone. Normal peristalsis begins at about the middle of the lesser curva-ture with a shallow depression corresponding to it on the greatercurvature. The wa\es tra^el toward the pylorus without inter-ruption. They become progressively deeper as they pass forwardand may bisect the barium mass at the upper limits of the the pylorus opens, the antrum then contracts as a whole, forcingits contents into the duodenum. If not, the waves move on to STOMACH 159 the pylorus. Peristaltic waves occur at intervals of about twentyseconds, varying with the patient and the meal used. Ordi-narily no more than two or three waves are visible on a stomachat the same time. They are increased in number and depth in theprone position and may be strongly affected by mental states, beingincreased by rage or inhibited by fear or Fig. —Tracing of normal stomach. Pathological Stomach.—The stomach is increased in size whendilatation has occurred as a result of pyloric obstruction or in con-ditions where there is a general loss of muscle tone. It is diminishedin size (1) as a result of increased tone from strong muscular develop-ment or as a reflex from disease of the duodenum, gall-bladder orappendix, and (2) as a result of infiltration of the wall as seen inulcer, carcinoma, adhesions, s^^hilis and linitis plastica. 160 GASTRO-INTESTINAL TRACT Changes in Position.—The stomach is displaced upward and tothe right where there are adhesions to the liver as a result of gall-bladder disease or from the presence of a large accumulation of gasin the splenic flexure or tumors in the left upper quadrant. In somecases of appendiceal disease or adhesions the lower pole is swungo\-er toward the right iliac fossa. It may be displaced and rotatedupward on its long axis in case of adhesions to the anterior abdomina
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