Portal Veins

The portal vein is the largest vein in the human body draining blood from the digestive system and its associated glands . It is formed by the union of the

• splenic vein and
• superior mesenteric vein

and divides into a right and a left branch, before entering the liver . Note that the portal vein drains blood into the liver , not from the liver. The blood (entering the liver ) from the portal vein, after being cleaned by the liver, flows into the inferior vena cava via the hepatic veins . The inferior mesenteric vein does not directly connect to the portal vein; it drains into the splenic vein. A second portal vein system connects hypothalamus and pituitary thus transferring releasing hormones with high concentration to the anterior pituitary lobe.

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