- Types:
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leptomeninges
the two innermost layers of the meninges; cerebrospinal fluid circulates between these innermost layers
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dura, dura mater
the outermost (and toughest) of the 3 meninges
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arachnoid, arachnoid membrane
the middle of the 3 meninges
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pia mater
the highly vascular innermost of the 3 meninges