The nerves of the brain and the spinal cord are protected by three surrounding membranes: the dura mater, arachnoid mater, and pia mater. Arachnoiditis is a pain disorder that develops when the ...

There are three meninges layers that completely envelop your brain and spinal cord, which make up your central nervous system. These layers are the dura mater, arachnoid mater, and pia mater.

An 11-year-old boy was diagnosed with multiple extradural arachnoid cysts at the spinal cord and cauda equina levels extending from the T5 to L5 vertebrae and surgery was performed.

Arachnoid cysts are fluid-filled sacs that occur in the brain or spinal cord. Most cysts do not cause symptoms or require treatment.

These consist of the pia mater (closest to the central nervous system organs), the arachnoid and the dura mater (farthest from the brain and spinal cord).

Panel C shows abnormal arachnoid mater (arrow) and an engorged vein (arrowhead) during surgery after a dural incision was made. Panels D through G show histopathological specimens of lesional cells.

A meningioma is a tumor that develops in the membranes lining the brain or spinal cord. Learn more about meningiomas, including their symptoms and treatments.