Thursday, July 12, 2007

STRUCTURE OF BRAIN

The brain has three main parts, the cerebrum, the cerebellum, and the brain stem. The brain is divided into regions that control specific functions. The cerebrum controls our behaviour, problem solving, creative thinking, emotions, intellectual qualities, judgment, eye movements, skilled movements, sexual behaviour, vision, reading skills.

Thus the Brain is a very complex, rather a super-super-computer, of only 1300-1400 gms weight, which is normally 2% of our body weight, but it consumes about 20% our blood flow and 20% of oxygen supply.It is surrounded by cerebrospinal fluid. The cells of the nervous system are quite fragile and need extensive protection from various types of infection,being crushed, and other types of harm. The brain and spinal cord are covered by a tough, translucent membrane, called the dura matter. Cerebrospinal fluid (CSF) is a clear, watery liquid that surrounds the brain and spinal cord, and is also found throughout the ventricle (brain cavities and tunnels). CSF cushions the brain and spinal cord from jolts.

Human skull surrounds and protects the brain. The spinal cord is surrounded by vertebrae (hollow spinal bones). Also, some muscles serve to pad and support the spine.

More subtly, the blood-brain barrier protects the brain from chemical intrusion from the rest of the body. Blood flowing into the brain is filtered so that many harmful chemicals cannot enter the brain.

Thus it all shows that the brain has been prepared and protected by God or Nature in a very meticulous way and taken all precautions to keep it safe.

0 comments: