Differentiate between the following pairs on the basis of what is mentioned within brackets:
Spinal nerves and cranial nerves (Number of nerves)

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Solution

Spinal nerves: These nerves arise from the spinal cord and innervate the visceral organs.
Cranial nerves: These nerves arise from the brain and innervate the head.
Spinal nerves
Cranial nerves
1.There are 31 pairs of spinal nerves which is split as 8 pairs of cervical nerves, 12 pairs of thoracic nerves, 5 pairs of lumbar nerves, 5 pairs of sacral nerves, and 1 pair of coccygeal nerves. 1.There are 12 pairs of cranial nerves
2. There are two branches of the spinal nerve which is the dorsal root made up of sensory nerve fibers and the ventral root made up of the motor nerve fibers. 2. A cranial nerve can be made of sensory or mixed (sensory and motor) nerve fibers.

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Spinal nerves	Cranial nerves
1.There are 31 pairs of spinal nerves which is split as 8 pairs of cervical nerves, 12 pairs of thoracic nerves, 5 pairs of lumbar nerves, 5 pairs of sacral nerves, and 1 pair of coccygeal nerves.	1.There are 12 pairs of cranial nerves
2. There are two branches of the spinal nerve which is the dorsal root made up of sensory nerve fibers and the ventral root made up of the motor nerve fibers.	2. A cranial nerve can be made of sensory or mixed (sensory and motor) nerve fibers.