Neurological system Meninges: Meninges is the protective membrane of the brain and spinal cord that covers the brain and spinal cord. There are three other 3 layers in this meninges. 1) Durometer(outer most layer), 2) Arachnoid Matter(intermediate layer), 3) Pia mater(Innermost layer) Thus, there are three layers of meninges that cover and protect the brain and spinal cord. Meningitis: If there is infection and inflammation in the meninges layer surrounding