The portal vein, or hepatic portal vein, is the main blood vessel of the portal venous system (PVS), which delivers blood to the liver from the stomach, intestines, spleen, gallbladder, and pancreas.

It is located in the middle of the chest and slightly towards the left ... The vena cava is the largest vein in the body. It carries deoxygenated blood from the body back to the heart.