Which veins join to form the portosplenic confluence?

Which veins join to form the portosplenic confluence?

• A. Superior Mesenteric Vein, Portal Vein, and Splenic Vein
• B. Inferior Mesenteric Vein, Portal Vein, and Hepatic Vein
• C. Splenic Vein, Inferior Mesenteric Vein, and Inferior Vena Cava
• D. Portal Vein, Hepatic Vein, and Inferior Mesenteric Vein

Answer: (A)

The portosplenic confluence is the junction where the splenic vein and the superior mesenteric vein merge to form the portal vein behind the neck of the pancreas. This portal vein then carries blood into the liver. The inferior mesenteric vein typically drains into the splenic vein or, less commonly, into the superior mesenteric vein, but it does not form this confluence by itself. The hepatic veins drain blood from the liver into the IVC, not into the portal system. So the combination of the splenic vein with the superior mesenteric vein creates the portal venous system, which is why that option is correct.

The portosplenic confluence is the junction where the splenic vein and the superior mesenteric vein merge to form the portal vein behind the neck of the pancreas. This portal vein then carries blood into the liver. The inferior mesenteric vein typically drains into the splenic vein or, less commonly, into the superior mesenteric vein, but it does not form this confluence by itself. The hepatic veins drain blood from the liver into the IVC, not into the portal system. So the combination of the splenic vein with the superior mesenteric vein creates the portal venous system, which is why that option is correct.