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The human nervous system

The nervous system is a highly organized system of nervous tissue that detects, relays and coordinates information about an organism’s internal and external environment.

All nervous systems contain nerve cells, called neurons, which convey information in the form of nerve impulses. They can produce a rapid, localized response.

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How is the nervous system organized?

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General structure of a neuron

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Types of neuron

sensory neurons:

relay neurons:

motor neurons:

There are several different types of neuron:

receptor organs CNS

sensory neurons

motor neurons

CNSeffectors

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Neuron structure