Sub-arachnoid space is present between

Options

A. Cranium and duramater
B. Duramater and arachnoid
C. Arachnoid and pia mater
D. Two lateral ventricles

Answer

To solve the question "Sub-arachnoid space is present between," we will break it down step by step:

### Step-by-Step Solution:

1. **Understanding the Layers of the Meninges**:
- The brain is protected by three layers of membranes known as the meninges. These layers are:
- Dura mater (outermost layer)
- Arachnoid mater (middle layer)
- Pia mater (innermost layer)

2. **Identifying the Sub-arachnoid Space**:
- The sub-arachnoid space is a specific area located between two of these layers: the arachnoid mater and the pia mater.

3. **Function of the Sub-arachnoid Space**:
- This space is filled with cerebrospinal fluid (CSF), which serves multiple functions, including cushioning the brain, providing nutrients, and removing waste.

4. **Conclusion**:
- Therefore, the sub-arachnoid space is present between the arachnoid mater and pia mater.

### Final Answer:
The sub-arachnoid space is present between the arachnoid mater and pia mater.

---