Medically reviewed by Sameena Zahoor, MDMedically reviewed by Sameena Zahoor, MD The meninges of the brain and spinal cord are three layers of membranes: the dura mater, arachnoid mater ...

Stationed within the meninges, squads of immune cells lie in wait, ready to unleash an inflammatory assault within the brain if needed. Holding these trigger-happy troops back during peacetime falls ...