Questions: The splenic vein drains into which of the following? Superior vena cava Subclavian vein Portal vein Azygos vein

The answer is the third one (or C): Portal vein.

Explanation for each option:

• Superior vena cava: This vein collects blood from the upper half of the body and returns it to the heart. It does not receive blood from the splenic vein.
• Subclavian vein: This vein is responsible for draining blood from the upper extremities and does not receive blood from the splenic vein.
• Portal vein: This vein is formed by the union of the splenic vein and the superior mesenteric vein. It carries blood from the gastrointestinal tract and spleen to the liver.
• Azygos vein: This vein drains the thoracic wall and some abdominal structures, but it does not receive blood from the splenic vein.

Summary: The splenic vein drains into the portal vein.