GROSS ANATOMY

Detailed explanation-1: -There are total 12 pairs of cranial nerves, that originate from our brain and brain stem. 3 sensory nerves are optic, olfactory and auditory. The motor nerves are trochlear, abducens, occulomotor, spinal accessory nerve and hypoglossal nerve. The mixed nerves are facial, trigeminal, vagus and glossopharyngeal..

Detailed explanation-2: -The vagus nerve is the longest and most complex of the 12 pairs of cranial nerves that emanate from the brain.

Detailed explanation-3: -Cranial nerves are the 12 nerves of the peripheral nervous system that emerge from the foramina and fissures of the cranium. Their numerical order (1-12) is determined by their skull exit location (rostral to caudal). All cranial nerves originate from nuclei in the brain.

Detailed explanation-4: -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.