Renal circulation

The circulation to and from the kidneys.

1. Renal pyramid
2. Efferent artery
3. Renal artery
4. Renal vein
5. Renal hilum
6. Renal pelvis
7. Ureter
8. Minor calyx
9. Renal capsule
10. Inferior renal capsule
11. Superior renal capsule
12. Afferent vein
13. Nephron
14. Minor calyx
15. Major calyx
16. Renal papilla
17. Renal column

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The renal circulation receives around 20% of the cardiac output. It branches from the abdominal aorta and returns blood to the ascending vena cava. It is the blood supply to the kidney, and contains many specialized blood vessels.

Circulation

The table below shows the path that blood takes when it travels through the glomerulus, traveling "down" the arteries, and "up" the veins. However, this model is greatly simplified for clarity and symmetry. Some of the other paths and complications are described at the bottom of the table.

Arteries (down)	Veins (up)
Abdominal aorta	Vena cava
Renal artery (Note 1)	Renal vein
Segmental arteries	-
Lobar arteries	-
Interlobar artery	Interlobar vein
Arcuate arteries (Note 2)	Arcuate vein
Interlobular artery (Note 3)	Interlobular vein
Afferent arterioles	Efferent arterioles (Note 4)
Glomerulus	Glomerulus

• Note 1: The renal artery also provides a branch to the inferior suprarenal artery to supply the adrenal gland.

• Note 2: The arcuate arterioles also supply blood to the vasa recta. The vasa recta supplies blood to the arcuate veins, thus bypassing the glomerulus.

• Note 3: The interlobular artery also supplies to the stellate veins.

• Note 4: The efferent arterioles don't directly drain into the interlobular vein, but rather they go to the peritubular capillaries first. The efferent arterioles also drain into the vasa recta.

External links

• Training at wisc-online.com