Renal portal system
A renal portal system is a
lampreys. It is not found in mammals.[1] Its function is to supply blood to renal tubules when glomerular filtration is absent or downregulated.[2]
Description
The main channel is the renal portal vein, developed from the posterior cardinal vein, which brings venous blood circulation from the tail and groin to the kidney, where it is shunted into a capillary network around the convoluted tubules. The blood then enters the renal vein, passing either through the subcardinal veins and into the posterior cardinal veins or through the posterior vena cava.[3] There is no renal portal vein in mammals.
Variations
In lungfish and tetrapods, the renal portal vein is joined by a vein traveling upwards from the
hepatic vein and the renal veins, and other portions become the internal gonadal (spermatic or ovarian) veins, and the suprarenal veins. The posterior cardinal veins become the veins of the pelvis, tail, and hind legs, and the part of the azygos vein that is closest to the heart.[5]
References
- ^ "CIRCULATORY SYSTEM". www.zoology.ubc.ca. Retrieved 7 February 2024.
- ^ Holz, P.H. (1999). The Reptilian Renal Portal System - A Review Bulletin of the Association of Reptilian and Amphibian Veterinarians Vol. 9 No. 1 [1]
- ^ Encyclopædia Britannica: Anatomy
- ^ Pet Plaec.com Retrieved November 20, 2015
- ISBN 0030584434.