Meninges

Definition

The meninges are three protective membranes that cover the brain and spinal cord. They consist of the dura mater, arachnoid mater, and pia mater.

5 Must Know Facts For Your Next Test

1. The dura mater is the outermost and toughest layer of the meninges.
2. The arachnoid mater is a middle, web-like layer filled with cerebrospinal fluid.
3. The pia mater is the innermost layer that directly adheres to the surface of the brain and spinal cord.
4. Meningitis is an inflammation of the meninges usually caused by infection.
5. The subarachnoid space, found between the arachnoid and pia maters, contains cerebrospinal fluid which cushions the central nervous system.

Review Questions

• What are the three layers of the meninges?
• Which meningeal layer is closest to the brain?
• What condition results from inflammation of the meninges?

Related terms

Cerebrospinal Fluid: A clear fluid found in the brain and spinal cord that cushions them from injury.

Blood-Brain Barrier: A filtering mechanism that blocks certain substances from entering brain tissue from blood vessels.

Central Nervous System: Comprises the brain and spinal cord, responsible for processing information and controlling activities within the body.