Which neuroglical cell helps in formation of blood brain barrier?

Options

A. Capillary endothelial cells
B. Astrocyte
C. Both A and B
D. Oligodendrocyte

Answer

To solve the question of which neuroglial cell helps in the formation of the blood-brain barrier, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Blood-Brain Barrier (BBB)**:
- The blood-brain barrier is a selective permeability barrier that protects the brain from potentially harmful substances in the bloodstream while allowing essential nutrients to pass through.

2. **Identify the Neuroglial Cells**:
- The question provides several options: Capillary endothelial cells, Astrocytes, both of these, and Oligodendrocytes.

3. **Function of Astrocytes**:
- Astrocytes are a type of glial cell in the brain. They play a crucial role in the formation and maintenance of the blood-brain barrier. They have end-feet that surround blood vessels and help regulate the passage of substances.

4. **Role of Capillary Endothelial Cells**:
- While capillary endothelial cells are part of the blood-brain barrier, they do not form the barrier alone. They work in conjunction with astrocytes.

5. **Examine Other Options**:
- Oligodendrocytes are another type of glial cell, but their primary function is to provide support and insulation to axons in the central nervous system, not to form the blood-brain barrier.

6. **Conclusion**:
- Based on the information, the neuroglial cell that helps in the formation of the blood-brain barrier is the **Astrocyte**.

### Final Answer:
The neuroglial cell that helps in the formation of the blood-brain barrier is the **Astrocyte** (Option 2).

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