Brain meninges - Definition

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The meninges are the three successive membranes covering the central nervous system, including the brain and spinal cord. The outermost meninges, and thus the closest to the skull bone is called the dura, the one below is the arachnoid, and the deepest meninges is the pia mater. The meninges store the cerebrospinal fluid between the arachnoid and the pia mater; the fluid's main function is to protect the brain and also to reduce the impact of shocks and potential hits. Various diseases can affect the meninges, the most famous being meningitis, inflammation of the meninges often infectious, or the dreaded subarachnoid hemorrhage.