Anatomy of portal system Esophageal veins The portal vein LIver Short supplies 70% of the gastric veins blood flow to the liver portal veins Left, night gastric veins but only 40% of the Splenic vein Portal vein liver oxygen supply Gastro- The remainder of the Veins from epiploic vein pancreas blood comes from the duodenum Inferior mesenteric hepatic artery, and vein Veins from ascending Superior blood from both of colon mesenteric vein these vessels mixes in the sinusoids Veins from Veins from descending jejunum ileum sigmoid colonAnatomy of Portal System The portal vein supplies 70% of the blood flow to the liver, but only 40% of the liver oxygen supply. The remainder of the blood comes from the hepatic artery, and blood from both of these vessels mixes in the sinusoids