The brain is an organ in the cranium. It is the principal organ of the nervous system. Unlike most other organs, topology has a very major role in function.
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- Overlying the nervous tissue of the brain, there are three protective coverings - the meninges.
- In addition, the brain also has its own blood supply. Movement between the blood and the brain is regulated by the blood-brain barrier.
- The brain is surrounded by cerebrospinal fluid (C.S.F). This serves the main purpose of cushioning the brain against physical shocks.
The brain itself is composed of: