Page 33 - Future Stars Science Explorer-5

The brain has three main parts : the cerebrum, the cerebellum and the
medulla.

1. Cerebrum : The cerebrum is the largest part of the brain. It helps us to
think, recall, remember and learn. It also controls the functions of sense
organs. Its dome-shaped surface is covered with deep ridges and grooves. It

also controls our voice. It is the centre of the intelligence.

2. Cerebellum : Below the cerebrum is the cerebellum. It controls the

muscles activity and maintains balance of our body and keeps it in an upright
position. If the cerebellum does not function properly, our body movements

become jerky and uncoordinated.

3. Medulla : Beneath the cerebellum lies the bulb-shaped medulla. It

connects the brain to the spinal cord. It controls involuntary actions like the
movements of the lungs and the heart. The medulla is active even when we
are asleep.

The brain needs a Cerebrum
Brainy Bites
Brainy Bites
continuous supply Brainy Bites
of blood and The brain uses approximately 20 per cent of
oxygen. A person the total oxygen pumped around the body.

faints if his heart is About 750 ml of blood pumps through the
not able to send Cerebellum Medulla brain every minute. Each half of the brain
enough blood to the controls the opposite half of the body.

brain. We must take enough sleep to give proper rest to our brain.

Spinal Cord and Nerves

The human brain is undoubtedly a
remarkable machine but it cannot work
Facet joints
alone. It is able to function with the help of the
spinal cord.

The spinal cord begins at the narrowed
Pedicle
base of the brain and runs down inside the
spine. It connects the other body parts to the

brain through thread-like structures called
The spinal cord nerves.

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