The cerebral circulatory system

The cerebral circulatory system - Figure 2–7 Major...

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The cerebral circulatory system Blood is transported through the body via a continuous system of blood vessels . Arteries carry oxygenated blood away from the heart into capillaries supplying tissue cells. Veins collect the blood from the capillary bed and carry it back to the heart. The main purpose of blood flow through body tissues is to deliver oxygen and nutrients to and waste from the cells, exchange gas in the lungs, absorb nutrients from the digestive tract, and help forming urine in the kidneys. All the circulation besides the heart and the pulmonary circulation is called the systemic circulation . Since it is the ultimate aim of this research project to image cerebral oxygenation and haemodynamics some aspects of the cerebral circulatory system are described below.
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Unformatted text preview: Figure 2–7 Major cerebral arteries and the circle of Willis. (Reproduced from [Marieb 1991]). Blood supply to the brain Figure 2–7 shows an overview of the arterial system supplying the brain. The major arteries are the vertebral and internal carotid arteries . The two posterior and single anterior communicating arteries form the circle of Willis , which equalises blood pressures in the brain’s anterior and posterior regions, and protects the brain from damage should one of the arteries become occluded. However, there is little communication between smaller arteries on the brain’s surface. Hence occlusion of these arteries usually results in localised tissue damage....
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This note was uploaded on 12/04/2011 for the course ANTHRO 2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.

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