Physical Support of the CNSBone serves to support and to protect the structures of the CNS and PNS:•Cranium•VertebraeMeninges are the membranes that line the structures and add additional support and protection:•Dura mater – thick layer next to the bone•Arachnoid mater – middle layer•Pia mater – thin layer next to the nervous tissueCerebrospinal fluid (CSF) protects and cushions the structures