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dura mater

outermost meninx covering the brain; composed of tough fibrous connection tissue

pia mater

innermost meninx covering the brain; delicate and highly vascular

arachnoid villi

structures instrumental in returning cerebrospinal fluid to the venous blood in the dural sinuses

choroid plexus

structure that forms the cerebrospinal fluid

arachnoid mater

middle meninx; like a cobweb structure

periosteal layer

its outer layer forms the periosteum of the skull

falx cerebri

a dural fold that attaches the cerebrum to the crista galli of the skull

tentorium cerebelli

a dural fold separating the cerebrum from the cerebellum

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