The Brain

Essay by toumancatJunior High, 7th gradeA, March 2004

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The brain is the portion of the central nervous system inside the skull. The brain is the control center for movement, sleep, hunger, thirst and all othervital activities. All emotions like anger, fear, sadness are controlled by the brain.

The medulla oblangata is the long lower most part of the brain system. At the top it is continuous with the pons and the midbrain. At the bottom it makes a gradual transition into the spinal cord. Sensory and motor nerve fibers connecting the brain and the rest of the body cross over to the opposite side as they pass through the medulla. Overall, the left half of the brain communicates with the right half of the body and the right half of the brain with the left half of the body.

The brain system is the most primitive part of the brain and is responsible for sustaining th basic functions of life, suc as breathing and blood pressure.

It includes three structures lying between and below the two cereral hemispheres, the midbrain, pons and medulla oblangata.

THe cerebrum is where the most high-level brain functions take place. Its two large hemispheres make up almost 85% of the brains weight. The two cerebral hemispheres are partially separated from each other by a deep fold known as the long itudinal fissure. Communication between the two is through several concentrated bundles of axons, called comissures, the largest of which is the corpus callosum.

Overoall the main purpose of the brain is to keep the body alive, healthy and to maintain a good life. The brain is 3 pounds and is pinkish gray tissue.