What are the protective layers around brain and spinal cord?

The protective layers around the brain and spinal cord are called meninges. These meninges are made of three layers:

* Dura mater: The dura mater is the outermost layer. It is tough and fibrous and helps protect the brain and spinal cord from injury.

* Arachnoid mater: The arachnoid mater is the middle layer. It is a mesh-like membrane that lies beneath the dura mater.

* Pia mater: The pia mater is the innermost layer. It is a thin, delicate membrane that closely follows the contours of the brain and spinal cord.

The meninges help provide a protective environment for the brain and spinal cord. They also help maintain intracranial pressure and regulate the flow of cerebrospinal fluid (CSF) around the brain and spinal cord.

Here is a table summarizing the three layers of meninges:

| Layer | Description |

|---|---|

| Dura mater | The dura mater is the outermost layer. It is tough and fibrous and helps protect the brain and spinal cord from injury. |

| Arachnoid mater | The arachnoid mater is the middle layer. It is a mesh-like membrane that lies beneath the dura mater. |

| Pia mater | The pia mater is the innermost layer. It is a thin, delicate membrane that closely follows the contours of the brain and spinal cord. |