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Sensory neurons (afferent neurons) are unipolar, bipolar, or multipolar shaped cells that conduct action potentials toward or into the central nervous system. They carry somatic nervous system signals from the skin, joints, skeletal muscles, sensory organs (eyes, ears, mouth, and nose). They also carry autonomic nerous system signals from the visceral organs (heart, lungs, vessels, etc).
The somatic nervous system (SNS) is the portion of the nervous system responsible for voluntary body movement and for sensing external stimuli.All five senses are controlled by this system. The SNS is a sub-part of the peripheral nervous system.he somatic nerve system controls all five senses. Heat and pain are all transmitted by afferent neurons. The central nervous system consists of the brain and spinal cord. Afferent neurons carry impulses from sense organs to the brain, while efferent neurons carry impulses from the brain to the muscles.