November 27, 2011

Readings of "The Human Brain"


The adult brain's unimpressive appearance gives few hints of its remarkable abilities. It is about two good fistfuls of pinkish gray tissue, wrinkled like a walnut, and with texture of cold oatmeal. It weighs a little over three pounds. Because the brain is the largest and most complex mass of nervous tissue in the body, it is commonly discussed in terms of its four major regions - cerebral hemispheres, diencephalon, brain stem and cerebellum. The cerebral hemispheres - left and right hemisphere are the most superior part of the brain. Speech, memory, logical and emotional response, as well as consciousness, interpretation of sensation and voluntary movement and many of the functional areas of the cerebral hemispheres have been identified. The cerebral hemispheres are divided into lobes that corresponds with their functions. The Frontal lobe for voluntary movement of our skeletal muscles, the occipital lobe for visualization, the temporal lobe for hearing and parietal lobe for somatic sensory area that allows us to feel pain, coldness or a light touch. A specialized area that is involved in our ability to speak is the Broca's area and the ability to understand is the Wernicke's area. Damage to this area will result to inability to speak and understand words. The diencephalon is the interbrain that sits atop the brain stem. It contains the thalamus, the relay station for sensory impulses and the hypothalamus that plays the role in the regulation of body temperature, water balance, metabolism. It is also the thirst center, the one that signals that we thirst for water. The brain stem is about the size of a thumb in diameter and approximately three inches long. It has the three structures the midbrain, pons, and the medulla oblangata. The medulla oblongata is the most important of the three because it is the center that controls heart rate, blood pressure, breathing, swallowing, vomiting and others. And the last the cerebellum which provides the precise timing for skeletal muscle activity and controls our balance and equilibrium. Because of its activity, body movements are smooth and coordinated. Now we know how very much important our brain is in our body. It is good also to have a healthy brain to have healthy functions of our body. Now we know...

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