Pia mater

Definition

The pia mater is the delicate innermost layer of the meninges that surrounds the brain and spinal cord, providing protection and cushioning. It is highly vascularized, supplying essential nutrients to the nervous tissue.

5 Must Know Facts For Your Next Test

1. The pia mater forms a tight membrane around the brain and spinal cord, adhering closely to their surfaces.
2. It contains numerous blood vessels that penetrate into the brain and spinal cord, facilitating nutrient delivery.
3. Inflammation of the pia mater can result in a condition known as meningitis, which can be caused by bacterial, viral, or fungal infections.
4. The pia mater works in conjunction with two other meningeal layers: the dura mater and arachnoid mater.
5. Subarachnoid space lies between the arachnoid mater and pia mater, filled with cerebrospinal fluid (CSF) that acts as a cushion for the central nervous system.

Review Questions

• What role does the pia mater play in protecting the brain and spinal cord?
• How does inflammation of the pia mater affect neurological health?
• Describe how blood vessels within the pia mater contribute to brain function.

Related terms

dura mater: The outermost layer of the meninges, providing robust protection for the central nervous system.

arachnoid mater: The middle layer of the meninges situated between dura mater and pia mater, containing cerebrospinal fluid.

meningitis: An inflammation of the protective membranes covering the brain and spinal cord, often caused by infection.