Portal vein receives blood from two major veins, Superior mesenteric vein that drains the entire small bowel and splenic vein which drains the entire large bowel and spleen. Portal vein supplies about 60% of the total blood flow to the liver.
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This system carries blood from the veins of the small intestine to the liver. This blood goes into the hepatic vein and into the inferior vena cava and back to the heart where it will pick up oxygen.
The hepatic portal system consists of veins that carry blood from the gastrointestinal tract to the liver.
The answer is, the superior mesenteric vein, splenic vein, and the inferior mesenteric vein.
Gastrosplenic Vein joins the Superior Mesenteric Vein and takes blood to Hepatic Portal Vein and delivers blood to liver.