brain, spinal cord, and nerve disorders
Noninfectious Meningitis
Introduction
Noninfectious meningitis is inflammation of the layers of tissue that cover the brain and spinal cord (meninges) and of the fluid-filled space between the meninges (subarachnoid space) when it is caused by disorders that are not infections or by drugs or vaccines. (See also Introduction to Meningitis .) The brain and spinal cord are covered by three layers of tissue called meninges. The subarachnoid space is located between the middle layer and the inner layer of the meninges. This space contains the cerebrospinal fluid, which flows through the meninges, fills the spaces within the brain, and helps cushion the brain and spinal cord. Noninfectious meningitis is a type of aseptic meningitis (meningitis caused by something other than the bacteria that typically cause acute meningitis). Within the skull, the brain is covered by three layers of tissue called the meninges. 