ANATOMY

Detailed explanation-1: -A stroke, sometimes called a brain attack, occurs when something blocks blood supply to part of the brain or when a blood vessel in the brain bursts. In either case, parts of the brain become damaged or die. A stroke can cause lasting brain damage, long-term disability, or even death.

Detailed explanation-2: -A stroke is any sudden event affecting the brain’s blood supply. The most common type, almost 80% of all strokes, is ischemic stroke, where the blood supply to the brain is cut off or severely reduced due to a blocked artery. A condition known as stenosis contributes to an individual’s risk for this type of stroke.

Detailed explanation-3: -Stroke. Stroke is an abrupt interruption of constant blood flow to the brain that causes loss of neurological function. The interruption of blood flow can be caused by a blockage, leading to the more common ischemic stroke, or by bleeding in the brain, leading to the more deadly hemorrhagic stroke.

Detailed explanation-4: -The middle cerebral artery is most often blocked during a stroke. The internal carotid arteries form the anterior (green) circulation and the vertebral / basilar arteries supply the posterior (red) circulation of the brain.

Detailed explanation-5: -What causes blockages in the brain and neck vessels? Blockages in the blood vessels of the neck and brain develop slowly over time. They occur when buildups of plaque form on the artery wall. Plaque is a deposit that contains calcium, cholesterol, and fibrous tissue, and appears when blood vessels are injured.