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meninges
meninges The three membranes that cover the brain and spinal cord (singular: meninx). The outside meninx is called the dura mater, and is the most resilient of the three meninges. The center layer is the pia mater, and the thin innermost layer is the arachnoid. Inflammation of the meninges (meningitis) can occur due to infection. See also meningitis.