Renal veins

Q Which of the following vessels drain(s) into the inferior vena cava.

• 1. Renal veins

  2. Superior mesenteric vein

  3. Inferior mesenteric vein

  4. Splenic vein

  5. All of the above

Inferior mesenteric, superior mesenteric, and splenic veins join to form the portal vein and drain proximally into the liver rather than directly into the inferior vena cava.