Dura Mater

The dura mater (or simply dura) is one of the layers of the meningeal covering of the brain and spinal cord. The dura is made up of two layers: the endosteal or periosteal layer that adheres lightly to the inner surface of the skull bones, and the meningeal layer that follows the general contour of the brain. These two layers stick to each over most of the brain except in certain locations where the layers separate to enclose the cranial dural sinuses. In the spine there is no connection between the dural sheath and the vertebra, rather there is a potential cavity called the epidural space