Where is the main portal vein formed?

Study liver anatomy and function with our medical students test. Engage with detailed multiple choice questions, each with hints and explanations. Prepare effectively for your test!

The main concept being tested is where the portal venous system originates. The main portal vein is formed behind the neck of the pancreas by the junction of the splenic vein and the superior mesenteric vein. This union occurs posterior to the head of the pancreas, and after its formation the portal vein ascends within the hepatoduodenal ligament to reach the porta hepatis of the liver. It is not formed in the porta hepatis, and it is not anterior to the head of the pancreas.