Rupture of the internal vertebral venous plexus results in an accumulation of blood in which of the following spaces (LQ)
|A||Space deep to the pia mater|
|B||Space between the arachnoid and duramater|
|C||Space between duramater and periosteum of vertebra|
|D||Space between the arachnoid and pia mater|
In the spine, the epidural space is the space outside the tough membrane called the dura mater, and within the spinal canal, which is formed by the surrounding vertebrae.
In the spine, the epidural space contains lymphatics, spinal nerve roots, loose fatty tissue, small arteries, and a network of large, thin-walled blood vessels called the epidural venous plexus.
In the head, the dura is continuous with the periosteum, the tough fibrous lining of the inside of the skull. This means that, in the head, the epidural space is known as a potential space, which means that normally it does not exist.
In rare circumstances, a torn artery (e.g. the middle meningeal artery) may cause bleeding which is sufficient to separate both the dura and periosteum from the bone; this is an epidural/extradural hematoma.