![]() ![]() They include smell, vision, eye, eye muscles, mouth, taste, ear, neck, shoulders, and tongue. Cranial nerves: They are the nerve fibers that carry information into and out of the brain stem.Spinal nerves: They are peripheral nerves that carry sensory information into and motor commands out of the spinal cord.Thus the somatic nervous system consists of two parts: In the body, 31 segments of nerves are in the spinal cord and 12 are in the brain stem.īesides these, thousands of association nerves are also present in the body. With each segment, there is a pair of sensory and motor nerves. There are 43 segments of nerves in the human body. ![]() The a- of afferent and the e- of efferent correspond to the prefixes ad- (to, toward) and ex- (out of). ![]() Afferent nerves are responsible for relaying sensation from the body to the central nervous system efferent nerves are responsible for sending out commands from the CNS to the body, stimulating muscle contraction they include all the non-sensory neurons connected with skeletal muscles and skin. The somatic nervous system consists of afferent nerves or sensory nerves, and efferent nerves or motor nerves. ![]()
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