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The human brain consists of millions of nerve cells (neurons). It weighs about 3 pounds and is jello-like in consistency. It floats in fluid (cerebral spinal fluid), is covered by protective membranes (meninges), and is enclosed in the bony skull (cranial vault). It communicates with the rest of the body through nerves running through the spinal cord and the peripheral nervous system. The brain is a large consumer of oxygen, which is supplied by a complex system of blood vessels.
The brain is sometimes referred to as "the organ of behavior" as it controls almost everything we do. It controls thoughts, memory, speech, emotions, sensory information, body movement, and the function of many other organs in the body. It is also responsible for the patterns of behavior we refer to as personality. The brain has four main sections, which include: the brainstem, cerebellum, the limbic system, and the cerebral cortex.
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