the arachnoid layer is located between the dura and pia matter in the skull and around the spinal cord.
further: these three layers make up the meninges, a system of membranes that surround and help protect the CNS (central nervous system) along with the help of the cerebral spinal fluid. dura is the outermost layer and pia is the innermost layer; arachnoid falls in between these two.
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