(c). The inferior mesenteric vein does not drain directly into the inferior vena cava. The blood from the inferior mesenteric vein gets to the inferior vena cava by way of the portal vein and the hepatic portal system
Work Step by Step
The inferior mesenteric and the superior mesenteric veins drain the digestive tract. The inferior mesenteric vein is joined by the splenic vein before it reaches the portal vein. The splenic -inferior mesenteric trunk is then joined by the superior mesenteric vein and the combined vessel then joins the hepatic portal vein. The hepatic portal vein takes the drainage from these three veins into the hepatic portal circulation. The portal vein carries nutrient-laden blood to the liver. The liver also has a direct arterial blood supply from the hepatic artery. The venules of the portal vein form a network of small vessels that journey alongside hepatic capillaries, After the liver has absorbed nutrients and detoxified potentially harmful substances, the blood in the portal sinusoids leaves through hepatic venules which feed into the hepatic vein. The hepatic vein empties directly into the inferior vena cava which leads to the right atrium of the heart. heart.