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dura mater

outermost meninx covering the brain, composed of tough fibrous connective tissue

pia mater

innermost meninx covering the brain, delicate and highly vascular

arachnoid villi

structures intstrumental in returning cerebrospinal fluid to venous blood in dural sinuses

choroid plexus

structure that forms cerebrospinal fluid

arachnoid mater

middle meninx, like a cobweb in structure

its outer layer forms periosteum of skull

dura mater

subarachnoid space

cerebrospinal fluid flows from 4th ventricle into central canal of spinal cord and this space, surrounding the brain and spinal cord

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