Motor nerves, also known as efferent nerves, are nerves that transmit nerve impulses from the center to the periphery. The human body consists of the central nervous system and the peripheral nervous system, the latter of which can be functionally divided into two major structural components, sensory and motor nerves, so that both somatic (spinal, cerebral) and visceral nerves in the peripheral nervous system can be categorized as sensory and motor nerves. Somatic motor nerves mainly innervate skeletal muscles and are generally subject to volitional control. They are composed of axons of motor neurons located in the anterior horn of the gray matter of the spinal cord and are distributed to the skeletal muscles of the trunk and limbs, and are also present in the cerebral nerves, which innervate the skeletal muscles of the eyes, ears, nose, pharynx, larynx, and mouth, etc., and govern the production of random movements. Visceral motor nerves mainly innervate smooth muscle, cardiac muscle and glands, generally not subject to volitional innervation, it is to control and regulate the material metabolic activities common to plants and animals, and plays an important role in maintaining the dynamic balance of the body’s internal and external, environment and the body’s normal life activities. When the motor nerve is damaged, pathological phenomena such as sensory abnormalities, muscle atrophy, and reflex abnormalities will occur in the parts controlled by this nerve.