The Human Brain

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The brain is made up of many cells, and is the control centre
of the body. The brain flashes messages out to all the other parts of the
body. The messages travel in very fine threads called nerves. The nerves
and the brain make up a system somewhat like telephone poles carrying wires
across the city. This is called the nervous system.

The nerves in the body don't just send messages from the brain to the
organs, but also send messages from the eyes, ears, skin and other organs
back to your brain. Some nerves are linked directly to the brain. Others
have to reach the brain through a sort of power line down the back, called
the spinal cord. The brain and spinal cord make up the central nervous
system.

The brain doesn't just control your organs, but also can think and
remember. That part of the brain is called the mind.

PROTECTING THE BRAIN

Twenty-eight bones make up the skull. Eight of these bones are
interlocking plates. These plates ...

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is called the cortex. It is mainly
made up of cell bodies of neurons called grey matter. Most of the work the
brain does is done in the cortex. It is very wrinkled and has many folds.
The wrinkles and folds give the cortex a large surface area, even though it
is squeezed up to fit in the skull.

The extra surface area gives the cerebrum more area to work. Inside
the cortex, the cerebrum is largely made up of white matter. White matter
is tissue made only of nerve fibres.

The middle region is deep inside the brain. It's chief purpose is to
connect the front and the back of the brain together. It acts as a
"switchboard", keeping the parts of your brain in touch with each ...

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