: Twelve pairs of nerves are emitted from the brain and 31 pairs of nerves are emitted from the spinal cord or spinal cord and are divided into finer and finer branches. Spread all over. These together are called peripheral nervous system. The brain. Carotid nerves originate from the eyes , nose , ears , tongue , teeth , face ,. Regulates the function of organs like heart , stomach etc. The limbs move through the nerves arising from the spinal cord to the hormone.