<Tr> <Th> FMA </Th> <Td> 50735 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <P> The portal vein or hepatic portal vein is a blood vessel that carries blood from the gastrointestinal tract, gallbladder, pancreas and spleen to the liver . This blood contains nutrients and toxins extracted from digested contents . Approximately 75% of total liver blood flow is through the portal vein, with the remainder coming from the hepatic artery proper . The blood leaves the liver to the heart in the hepatic veins . </P> <P> The portal vein is not a true vein, because it conducts blood to capillary beds in the liver and not directly to the heart . It is a major component of the hepatic portal system, one of only two portal venous systems in the body--with the hypophyseal portal system being the other . </P>

Where does the blood in the hepatic portal vein come from