The Passage of Food Through the Human Stomach

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Abstract
Of 16 healthy rf subjects, given fried meat balls or oatmeal porridge as solid food, oatmeal gruel or water as liquid, and Neobar, a very finely ground powder, as contrast substance, 14 showed a definite arrangement of the food in layers; it was generally evacuated in the order in which it was ingested. In the full stomach, solid food followed the sulcus salivalis, but the liquid food sank down toward the pylorus without mixing with the solid food, and was rapidly evacuated into the duodenum. In filling the empty stomach neither solid nor liquid food followed the sulcus salivalis. Practically speaking, the stratification means that the stomach content is not homogeneous, a fact which must be taken into consideration in estimating results arrived at by removal of portions of such contents.

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