The Dura Mater

Consists of fibrous connective tissue and contains a large number of sensory nerves and blood vessels. The deep surface is separated from the arachnoid by the subdural space, which contains fluid. The dura mater surrounding brain and spinal cord is continuous through the foramen magnum. The dura mater surrounding the spinal cord, the spinal dura, is separated by an epidural space from the inner periosteum lined surface of the vertebrae. The epidural space contains blood vessels (veins) and fat. The dura mater surrounding the brain, the cerebral dura, in contrast adheres to inner periostal lining of the skull bones. So there is no (normally) epidural space, but such space may arise in case of bleeding (epidural bleeding).