|The Blood Supply of the Brain|
| Food and
oxygen are carried to the brain by many blood vessels. These vessels are
found on the surface of the brain and deep within the brain. The blood
vessels (and nerves) enter the brain through holes in the skull called
foramina (red arrows in the picture on the
Although the brain is only about 2% of the total body weight in humans, it receives 15-20% of the body's blood supply. Because brain cells will die if the supply of blood which carries oxygen is stopped, the brain has top priority for the blood. Even if other organs need blood, the body attempts to supply the brain with a constant flow of blood.
|The blood brings many
materials necessary for the brain to function properly. The blood also
removes materials from the brain.|
|Base of the brain|
Only some of the vessels that exist in a real brain have been labeled.
You may know someone, a parent or grandparent, who has had a "stroke," also called a "brain attack." What exactly is a stroke? A stroke occurs when the blood supply to the brain is stopped. If this happens for enough time, neurons will start to die because they will not get enough oxygen. Paralysis or aphasia (loss of speech) are possible consequences of a stroke.
There are two major causes of a stroke:
There are several warning signs that occur with a brain attack:
There are several conditions linked to stroke:
|Did you know?|
More about stroke:
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Neuroscience for Kids