What is the length of the superior mesenteric vein?

The superior mesenteric vein (SMV) is approximately 8 to 10 centimeters long. It runs alongside the superior mesenteric artery and drains blood from the small intestine and the proximal part of the large intestine. The SMV joins with the splenic vein to form the hepatic portal vein, which carries blood to the liver. Its length can vary slightly among individuals.