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Classify peripheral nervous based on the...

Classify peripheral nervous based on the nerves arising from the brain and the spinal cord.

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Peripheral nervous system is formed by the nerves arising from the brain and the spiN/Al cord. The nerves arising from the brain are called cranial nerves. Nerves arising from spiN/Al cord are called spiN/Al nerves.
Cranial Nerves: In man, there are 12 pairs of cranial nerves. Some of the cranial nerves are sensory Eg: optic nerve which innervates the eye> Some are motor nerves which helps in rotation of eyeball. It also innervates the eye muscles, muscles of iris and tear gland.
SpiN/Al Nerves: There are 31 pairs of spiN/Al nerves. Each spiN/Al nerve has a dorsal sensory root and the ventral motor root. The direction of impulses in dorsal spiN/Al root is towards the spiN/Al cord and in ventral spiN/Al root away from the spiN/Al cord.
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