Highly vascular and closely inverting protective coat around brain is known as

Options

A. Arachnoid
B. Pia mater
C. Dura mater
D. Sub-arachnoid space

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the name of a highly vascular and closely inverting protective coat around the brain.

2. **Identifying the Protective Coats**: The protective coverings of the brain are known as meninges. There are three layers of meninges:
- Dura mater (outermost layer)
- Arachnoid mater (middle layer)
- Pia mater (innermost layer)

3. **Analyzing the Layers**:
- **Dura Mater**: This is the tough outer layer that is closest to the skull. It is not highly vascular.
- **Arachnoid Mater**: This is the middle layer that has a web-like structure but is not the most vascular.
- **Pia Mater**: This is the innermost layer that is directly in contact with the brain. It is highly vascular and closely adheres to the surface of the brain.

4. **Conclusion**: Since the question specifies a layer that is highly vascular and closely inverting around the brain, the correct answer is the **Pia Mater**.

5. **Final Answer**: The highly vascular and closely inverting protective coat around the brain is known as the **Pia Mater**.

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