![]() The region between the bones and the dura mater is called epidural space. The dura mater of the spinal cord is composed of only one layer. However, in some regions of the brain they separate to form large space filled with venous blood called dural sinuses. These two layers are usually fused together. The dura mater of the brain is made by two layers, the periosteal layer which is more superficial and attached to the skull, and the meningeal layer, which lies deep to the first layer. It is directly attached to the inner surface of the bones of the cranium and to the very end of the vertebral cavity. It encloses the entire CNS and the major blood vessels that enter the cranium and vertebral cavity. The name comes from the Latin for “tough mother” to represent its physically protective role. Like a thick cap covering the brain, the dura mater is a tough outer covering. (Image credit: "Meningeal Layers" by OpenStax is licensed under CC BY 4.0) An arachnoid villus is shown emerging into the dural sinus to allow CSF to filter back into the blood for drainage. The arachnoid and subarachnoid space are in-between. ![]() The pia mater is adjacent to the surface of the brain. ![]() Within it, veins and the superior sagittal sinus lie. The dura mater is adjacent to the inner surface of the cranium. The layers of the meninges are shown under neath the bones of the skull. ![]()
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