Schematic diagram of the renal blood supply. The renal artery gives rise to interlobar arteries that branch into arcuate arteries at the border between the medulla and cortex. Interlobular arteries (IL) branch from the arcuate arteries and travel toward the renal capsule, giving off afferent arterioles to the glomeruli (G). Glomeruli in the outer part of the cortex (Gl, G2) send efferent arterioles to the peritubular capillaries (PC) that surround the tubules in the cortex; glomeruli near the medulla (G3), the juxtamedullary glomeruli, send efferent arterioles almost entirely into the medullary plexus (MP) of capillaries via the arteriole rectae spuriae (ARS). Blood returns from the capillaries via veins that enter the arcuate veins. Stellate veins (SV) near the capsule drain both the capsular (CC) and the peritubular capillaries.
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