Arcuate arteries
Arteriae arcuatae renis
Arched arteries running along the corticomedullary junction over the bases of the renal pyramids, giving rise to the cortical radiate (interlobular) arteries.
Overview
The arcuate arteries are continuations of the interlobar arteries that curve around the base of each pyramid, parallel to the kidney surface, marking the corticomedullary junction on a cut section. They do not form true anastomotic arcades with neighbouring arcuate arteries (functionally they remain end arteries). From their convex (outer) aspect they give off the cortical radiate (interlobular) arteries at right angles into the cortex; small branches also pass directly to juxtamedullary glomeruli.
Arcuate veins accompany them and drain into interlobar veins.
- Location
Corticomedullary junction at the bases of the renal pyramids.
Anatomy
- Branches
Cortical radiate (interlobular) arteries.
Function
- Distribute blood along the corticomedullary junction to the cortex
Clinical significance
Imaging landmark
On ultrasound, arcuate vessels appear as bright echogenic dots at the corticomedullary junction; calcification of these arteries occurs in diabetes and CKD.
Compiled from standard anatomy and physiology references — see the Urinary System sources. For education only; not medical advice.