protective membranes covering the brain. meninges

alzheimer anatomy aponeurosis arachnoid bacteria bacterial biology body bone brain care central cerebellum cerebral cerebrospinal cerebrum cortex cross deafness dementia diagram disease dura epilepsy fluid ganglia head health healthy human hydrocephalus illustration infection inflammation layers lobe mater matter medical medicine meninges meningitis mental nervous neurology nuclei organ periosteum pia sagittal science section sinus skin skull subarachnoid superior system tissue