The inferior mesenteric vein drains which part of the intestine?

• A. Small intestine
• B. Large intestine
• C. Both small and large intestine
• D. Stomach

Answer: (B)

The inferior mesenteric vein is responsible for draining the blood from the large intestine, specifically the portions of the colon that it serves. This includes the descending colon, sigmoid colon, and part of the rectum. The blood collected by the inferior mesenteric vein ultimately flows into the splenic vein, which then joins the superior mesenteric vein to form the hepatic portal vein.

The small intestine is drained primarily by the superior mesenteric vein, which collects blood from the jejunum and ileum areas. Therefore, while the small intestine is essential for digestion and nutrient absorption, it does not fall under the drainage area of the inferior mesenteric vein. The stomach is also not associated with the inferior mesenteric vein. It is drained by different structures, including the gastric veins that lead to the portal system.

Thus, the correct identification of the inferior mesenteric vein's function is that it drains the large intestine, making the correct choice clear.