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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).
1 Sensory neurons conduct action potentials to the spinal cord. 2  Sensory neurons synapse with excitatory interneurons that synapse with motor neurons. 3  Excitation of the motor neurons results in contraction of the flexor muscles and withdrawal of the limb from the painful stimulus. sensory neurons conduct action potential to the spinal cord. 2  Sensory neurons synapse directly with motor neurons. 3  Motor neurons conduct action potentials to the muscle,causing it to contract and resist being stretched.