arachnoid of brain

that portion of the arachnoid which lies within the cranial cavity and surrounds the brain and the cranial portion of the subarachnoid space. In several sites it is relatively widely-separated from the pia mater, creating the cranial subarachnoid cisterns. Syn: arachnoid mater cranialis [NA], arachnoid mater encephali, cerebral part of arachnoid.

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