connects connects digestive tract liver portal system hepatic portal system A portal system that begins in capillaries in the wall of the digestive tract and and runs as the hepatic portal vein to the liver. uberon AAO:0010225 portal system of liver hepatic-portal system UBERON:0010194 Part of the circulatory system which includes the ventral abdominal vein, pelvic veins, and portal vein and collects blood from the pelvic region, liver, gall bladder and stomach.[AAO]