SubArachnoid Hemorrhage



• A subarachnoid hemorrhage is a bleeding in the brain in the meninges between brain and skull. To be more precise: a bleeding under the arachnoid in the subarachnoid space.

• There is a one centimer wide space in which the afferent and draining vessels to and from the brain are located.

• In one of the afferent blood vessels, the main artery, there can be a sort of balloon an aneurysm.

• If the balloon expands and bursts a bleeding occurs between the brains and the skull.


• The meninges are located around the brains. The meninges perform a function in the supply to the brains and also serve as a pad for the protection of the brains. The layers around the brains are (from outside to inside)

• Scalp (1)

• Periosteum (2)

• Bone (3)

• Dural (Dura Mater 4)

• Arachnoid (5)

• Subarachnoid space

• Soft meningeal (Pia mater 6)

• If a blood vessel bursts or tears a bleeding occurs in this brain area. The brain cells in that area don’t get enough oxygen and / or nutrients and then die.

• The flowing blood creates more pressure or swelling in this brain region. Bleeding may result from hypertension or congenital vascular disease, atherosclerosis, aneurysm.


Because the subarachnoid hemorrhage is cerebral hemorrhage for additional information we refer to the page about cerebral hemorrhage.

On the website about SAH of the stroke center you can find more information about SAH.