Anatomy General 6c1460fc True about valves in portal venous system - A Present at the junction of superior mesenteric artery with the splenic artery B Within the portal vein only C The whole system is valveless D In the intrahepatic portion of portal vein High-Yield Explanation Although demonstrable during fetal and early neonatal period, there are no valves in a portal vein and its tributaries in the postnatal period.