The area of brain affected and the extent of the damage depend on which blood vessel is affected.įor example, if you lose the blood supply from a main carotid artery then a large area of your brain is affected, which can cause severe symptoms or death. These branch into many smaller arteries which supply blood to all areas of the brain. The blood supply to the brain comes mainly from four blood vessels (arteries) - the right and left carotid arteries and the right and left vertebrobasilar arteries (see diagram below). A stroke is sometimes called a brain attack. Soon after the blood supply is cut off, the cells in the affected area of brain become damaged or die. The brain cells need a constant supply of oxygen from the blood. A stroke means that the blood supply to a part of the brain is suddenly cut off.
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