The cranial dura mater is the dura mater inside the cranial cavity of the skull and envelops the brain. It has two sublayers: the outer periosteal/endosteal layer that covers the inner aspect of the skull, and the inner meningeal layer that surrounds the brain. From the foramen magnum downwards, the inner meningeal layer of the cranial dura mater continues as the spinal dura mater.In certain ...