. Roentgen interpretation; a manual for students and practitioners . Fig. 133.—Hyperperistalsis in an othenvise normal stomach. ttnd transverse. In asthenic states it is low and, because of the lackof tone, the meal settles in the lower pole, allowing the walls of thecardia to collapse. In the prone position the stomach swings upunder the liver, hing more transversely. When empty, its wallsare in apposition except at the cardia which is dilated by thegas bubble. As the stomach fills, the meal collects in a funnel-shaped shadow below the gas bubble and gradually fills out the 158 GASTRO-INTESTI
. Roentgen interpretation; a manual for students and practitioners . Fig. 133.—Hyperperistalsis in an othenvise normal stomach. ttnd transverse. In asthenic states it is low and, because of the lackof tone, the meal settles in the lower pole, allowing the walls of thecardia to collapse. In the prone position the stomach swings upunder the liver, hing more transversely. When empty, its wallsare in apposition except at the cardia which is dilated by thegas bubble. As the stomach fills, the meal collects in a funnel-shaped shadow below the gas bubble and gradually fills out the 158 GASTRO-INTESTINAL TRACT body and antrum. In atonic stomachs the meal passes rapidly tothe lower pole which enlarges out of proportion to the body. The outline is smooth except for indentations due to peristalsis,and a variable amount of irregularity on the greater curvature dueto pressure from the colon and spleen. Small transient indentationsoccur on the margins of the antrum near the pylorus. They aremost common on the lesser curvature and are without 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 nausea.
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