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The human body is divided into many different parts called organs. All of the parts are controlled by an organ called the brain, which is located in the head. The brain is made up of many cells, and is the control center of the body. The brain is a soft, wrinkled mass of tissue weighing about 2.75 pounds and has a whitish-pink appearance. The human brain is the most complex organ known to man, made up of different intricate parts. These different structures are all important in the everyday activities of all human beings. In speaking of the most important parts of the brain I feel it necessary to start at the bottom portion of the brain, the brain stem. The brain stem rises from the top of the spinal cord, and holds the pons and the medulla, also at the core of the brain stem is the reticular activating system. The brain stem is such an important part of the brain because of the three parts found within. The pons is responsible for such things as sleeping, walking, and dreaming. If this crucial part of the brain were missing impaired coordination of movement and posture would be the result. The most important part