There are three layers of meninges, which lie between the brain and the bones which surround it.
There are three sorts of intracranial haemorrhage caused by bleeding into the different spaces.
Intra-cerebral bleeds can also occur in stroke disease.
The extradural space is a potential space. (The periosteal dura is periosteum, so it is tightly connected to the overlying bone.) However, once bleeding occurs into this space, the dura is slowly separated from the skull up to the cranial sutures. Once these are reached, the only way for the volume to increase is by impacting on the brain.
Again this is a potential space. Haemorrhage into here is caused by a jerking movement, which is required to separate the arachnoid from the dura. The bleeding into this space is venous in origin, so the progression is slow. Often the elderly get these weeks after a trivial injury that has been forgotten. See subdural haemorrage.