APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -Peripheral nervous system is divided into somatic and autonomic nervous systems. Somatic nervous system consists of cranial nerves and spinal nerves. There are 12 pairs of cranial nerves in the brain connecting head and upper body, while 31 pairs of spinal nerves connecting the rest of the body.

Detailed explanation-2: -The Sensory-Somatic Nervous System. The sensory-somatic system consists of 12 pairs of cranial nerves and 31 pairs of spinal nerves.

Detailed explanation-3: -Thirty one pairs of spinal nerves exist: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal. Proximal branches: Each spinal nerve branches into a posterior root and an anterior root. The spinal or posterior root ganglion is occupied by cell bodies from afferent neurons.

Detailed explanation-4: -Twelve pairs of cranial nerves emerge from the inferior surface of the brain. All of these nerves, except the vagus nerve, pass through foramina of the skull to innervate structures in the head, neck, and facial region.