Generality
Nerves are important structures of the peripheral nervous system, which result from the grouping of several axons and which have the important task of transporting nerve impulses from the central nervous system to the periphery, and vice versa.
The cranial nerves originate in the brain and innervate the head and neck; the spinal nerves, on the other hand, originate in the spinal cord and innervate all parts of the body not innervated by the cranial nerves.
Depending on the type of axons that constitute them, nerves can cover three functions: a motor function, a sensory function and a mixed function. Nerves with motor function transmit nerve impulses from the central nervous system to skeletal muscles and glands; the sensory nerves conduct nerve impulses from the peripheral anatomical districts (eg skin receptors) to the central nervous system; finally, nerves with mixed function have the double capacity to act both as nerves with motor function and as nerves with sensory function.
