Noun
The tough, fibrous membrane, which lines the cavity of the skull and spinal column, and surrounds the brain and spinal cord; -- frequently abbreviated to dura.
Source: Webster's dictionaryA closed (non-missile) head injury is where the dura mater remains intact. Source: Internet
A penetrating head injury occurs when an object pierces the skull and breaches the dura mater. Source: Internet
The dural venous sinuses within the dura mater surrounding the brain receive blood from the brain and also are a point of entry of cerebrospinal fluid from arachnoid villi absorption. Source: Internet