Question

Are there 31 pairs of cranial nerves and 12 pairs of spinal nerves?

Answer 1

Hint: In vertebrates, a spinal nerve is one of numerous paired peripheral nerves that emerge from the spinal cord. There are 31 pairs in humans: eight cervical, twelve thoracic, five lumbar, five sacral, and one coccygeal. Each pair links the spinal cord to a different part of the body.

Complete answer:
12 pairs of cranial nerves arise from the brain.
31 pairs of spinal nerves: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal.

Each spinal nerve branches into two roots near the spinal cord. One, made up of sensory fibres, enters the spinal cord via the dorsal root; its cell bodies are located outside the spinal cord in a spinal ganglion. The other, made up of motor fibres, exits the spinal cord through the ventral root; its cell bodies are located throughout the spinal cord.

The motor, sensory, and other functions of the spine are controlled by 31 pairs of spinal nerves. The cervical, thoracic, lumbar, sacral, and coccygeal levels all have these nerves.

The peripheral nervous system consists of 12 cranial nerves and 31 pairs of spinal nerves that transmit nerve impulses from the CNS to the rest of the body in order to govern the human body's functioning.

A spinal nerve is a mixed nerve that connects the spinal cord to the rest of the body, carrying motor, sensory, and autonomic data. There are 31 pairs of spinal nerves in the human body, one on each side of the vertebral column.

Note:
The spinal nerves are the nerves that attach to the spinal cord. These nerves have a considerably more regular arrangement than the cranial nerves. All of the sensory and motor axons in the spinal nerves split into two nerve roots. The dorsal nerve root is where the sensory axons enter the spinal cord. The ventral nerve root is where the somatic and autonomic motor fibres emerge. Each neuron's dorsal root ganglion is an expansion of the spinal nerve.