NS..

nervous system

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main organs of nervous system:

1. brain

2. spinal cord

brain: controls most body's activity
spinal cord: work as collecting point of signal the has been detected from the enviroment by sensory neurons.
neurons are the building unit of nervous system.

neuron cell

multiple neurons form a neuron

it includes sensory, motor and interneurons of the brain and spinal cord
this system controls most body activities

central NS

it includes all sensory neurons and motor neurons which are not part of central nervous system.
it is divided into:
somatic NS

voluntary
autonomic NS

peripheral NS

major divisions of NS

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what are the major divisions of NS