Schematic diagram of the cerebral meninges. The outer layer, the dura mater, is joined to adjacent bone of the cranial cavity (not shown). The inner layer, the pia mater, adheres to the brain surface and follows all its contours. Note that the pia mater follows the branches of the cerebral arteries as they enter cerebral cortex. The intervening layer, the arachnoid, is adjacent but not attached to the dura mater. The arachnoid sends numerous, web-like arachnoid trabeculae to the pia mater. Located between the arachnoid and the pia mater is the subarachnoid space; it contains cerebrospinal fluid. The space also contains the larger blood vessels (cerebral arteries) that send branches into the substance of the brain.
blood vessel dura mater arachnoid subarachnoid space pia mater cerebral cortex
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