Peripheral Nervous
System
Peripheral nervous
system is formed by the nerves arising from the brain and the spinal cord. The
nerves arising from the brain are called cranial nerves. Nerves arising
from spinal cord are called spinal nerves.
In man, there are 12
pairs of cranial nerves. Some of the cranial nerves are sensory e.g. 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.
There are 31 pairs
of spinal nerves. Each spinal nerve has a dorsal sensory root and the ventral motor
root. The direction of impulses in dorsal spinal root is towards the spinal
cord and in ventral spinal root away from the spinal cord.
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