Go through the following statements .
(i) Hypophysial portal vein carries blood from the hypothalamus to the anterior lobe of the pituitary gland.
(ii) The central nervous system lacks lymphatic channels.
(ii) The thoracic duct drains into the left subclavian vein.
(iv) Hepatic portal vein is formed by the union of superior mesenteric vein and splenic vein.
Which of these are correct ?

Options

A. (i) ,(ii) & (iii)
B. (ii) , (iii) & (iv)
C. (i) ,(iii) & (iv)
D. All are correct

Answer

To determine which statements are correct, let's analyze each one step by step:

1. **Statement (i)**: "Hypophysial portal vein carries blood from the hypothalamus to the anterior lobe of the pituitary gland."
- The hypophysial portal vein indeed carries blood from the hypothalamus to the anterior lobe of the pituitary gland. This is a well-established fact in human anatomy and physiology. Therefore, this statement is **correct**.

2. **Statement (ii)**: "The central nervous system lacks lymphatic channels."
- It is true that the central nervous system (CNS) does not have traditional lymphatic vessels. Instead, it has a unique system for waste clearance known as the glymphatic system, which functions differently from the lymphatic system found in other parts of the body. Hence, this statement is also **correct**.

3. **Statement (iii)**: "The thoracic duct drains into the left subclavian vein."
- The thoracic duct, which is the largest lymphatic vessel in the body, does indeed drain lymphatic fluid into the left subclavian vein. This is a fundamental aspect of the lymphatic system. Therefore, this statement is **correct**.

4. **Statement (iv)**: "Hepatic portal vein is formed by the union of superior mesenteric vein and splenic vein."
- The hepatic portal vein is formed by the convergence of the superior mesenteric vein and the splenic vein, which is crucial for directing blood from the gastrointestinal tract and spleen to the liver. Thus, this statement is also **correct**.

After analyzing all four statements, we conclude that all of them are correct.

**Final Answer**: All statements are correct.

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