Cerebral dural mater硬脑膜 Characters a thick and dense inelastic membrane that composed of two layers, an inner or meningeal and outer or endosteal It is in loose contact witl calvaria. and most strongly adherent to base of skullCerebral dural mater 硬脑膜 Characters ◼ A thick and dense inelastic membrane that composed of two layers, an inner or meningeal and outer or endosteal ◼ It is in loose contact with calvaria, and most strongly adherent to base of skull