Scheme of renal tubule and its vascular supply.
|Latin||Arteriae interlobulares renis,
arteriae corticales radiatae
|Arcuate arteries of the kidney|
Cortical radiate arteries (or cortical radial arteries or interlobular arteries[a]) are renal blood vessels given off at right angles from the side of the arcuate arteries looking toward the cortical substance. The cortical radiate arteries pass directly outward between the medullary rays to reach the fibrous tunic, where they end in the capillary network of this part.
In their outward course, they give off lateral branches, which are the afferent arterioles that supply the renal corpuscles. The afferent arterioles, then, enter Bowman's capsule and end in the glomerulus.
From each glomerulus, the corresponding efferent arteriole arises and then exits the capsule near the point where the afferent arteriole enters. Distally, efferent arterioles branch out to form dense plexuses (i.e., capillary beds) around their adjacent renal tubules. For cortical nephrons, a single network of capillaries, known as the peritubular capillaries, surrounds the entire renal tubule, whereas for juxtamedullary nephrons, the peritubular capillaries surround only the proximal and distal convoluted tubules, while another network branching from the efferent arteriole, known as the vasa recta, surrounds the nephron loop (of Henle).
- Due to the likelihood of confusing the terms interlobular arteries and interlobar arteries (both part of the renal circulation), these arteries should now be referred to as cortical radiate arteries, and the term interlobular should be left to the antiquities of the 1918 version of Gray's.
- Histology image: 16015loa — Histology Learning System at Boston University - "Urinary System: kidney, H&E, interlobular artery and vein"