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Nervous System
The organs which help us to know something about the world around us are called sense organs.
Iris is the coloured part of the eye.
Cornea is the main len of the eye and helps to focus.
The black spot in the centre of the iris is pupil.
Retina is connected to the brain through optic nerve.It acts as screen on which image is formed.
Skin is the protective outer covering of the body.It contains nerve endings which detect pain,sweat glands.
There are four types of tastebuds in the mouth.
An adult brain weighs about 1.5 kg and contain 14 billion nerve cells.
Medulla joins the brain to spinal cord.
Cerebellum is the small part of the brain.
Cerebrum is the largest part of the brain.
Spinal cord is a tube which begins from the medulla and goes to the middle of the back.
Nerves are made up of nerve cells.
Neurons join together to form nerves.
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