'''Arachnoid mater''' is one of the three layers [[meninges]] tissue that surround the [[central nervous system]]. It forms the middle layer creating the outer boundary of the [[subarachnoid space]]. | '''Arachnoid mater''' is one of the three layers [[meninges]] tissue that surround the [[central nervous system]]. It forms the middle layer creating the outer boundary of the [[subarachnoid space]]. |