Stratification of Absorbed Solutions in Mesenterial Veins1

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Abstract
Stratification in the mesenterial venous blood of solutions which have been absorbed from the small intestine was demonstrated. Isotonic and hypotonic sodium phosphate solution and water were transported in the upper, and hypertonic glucose and saline solutions in the lower streamlines in the mesenterial veins. These observations show that the blood stream is laminar and that the streamline flow demonstrated previously in the portal vein after injection of dyes etc. also occurs in the mesenterial part of the venous portal circulation after intestinal absorption. No stratification could be demonstrated in the mesenterial veins after absorption of isotonic glucose and sodium chloride solution. The reasons for the presence and absence of stratification are discussed and different absorption mechanisms are considered. It is suggested that stratification depends on“intestinal short‐cut absorption”. According to this hypothesis, under certain conditions translocation from the intestinal lumen of intraintestinally instilled solutions to the capillaries takes place via gaps between the mucosal epithelial cells. These gaps are produced by expulsion of cells from the epithelial border during the absorption.