BRAIN :- DON OF OUR BODY

BRAIN - THE SEAT OF INTELLIGENCE

• Humans are scientifically classified as the species "Homo sapiens" meaning "wise man". It is indeed the capacity for learning, language, emotion and abstract thought that distinguishes the human species from others. And the plinth for all that is the human brain.
• A human brain accounts for about 2% of the body weight. A full grown brain weighs about 1.4 kilograms.
• Though Almost all its constituent , nerve cells or neurons are already present, the brain weighs only about .5 kgs of birth.
• A human brain contains about 10-100 billion neurons and even more supporting cells named , glia. 
• At rest it consumes about 20% of the oxygen used by the entire body. More than 3-5 minutes of oxygen deprivation may result in serious damage to the brain.
• Human brains have twelve pairs of cranial nerves that originate directly from the brain.
• The brain looks like a large wrinkled walnut made of a greyish -pink, jelly like substance.
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• It sits inside the skull, at the upper end of the spinal cloumn. The bones of the skull shield it from the injuries.
• The brain has three main divisions 

1. CEREBRUM
2. CEREBELLUM
3. BRAIN STEM