Blood supply and distribution of albumin and red cells in rabbit kidney

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Abstract
Intravenously administered I131 albumin (RISA) is more concentrated in medulla than in cortex of the normal rabbit kidney. In contrast, labeled erythrocytes are more concentrated in normal rabbit renal cortex than in medulla. Collateral circulation to rabbit renal parenchyma arises from capsular and ureteral arteries. The magnitudes of these two blood supplies are small and roughly equal. Both cortex and medulla receive blood from both groups of collaterals. When capsular vessels alone supply the kidney, renal weight and concentrations of RISA and labeled erythrocytes increase progressively with time up to 1 hr. This suggests a preponderance of arterial over venous and lymphatic collaterals after acute renal pedicle occlusion. RISA concentration of the contralateral medulla of the rabbit whose left renal artery and vein have been occluded increases rapidly and remains high for 1 hr as compared to control animals.

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