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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).
Peripheral Nervous System (PNS) The peripheral nervous system consists of nerve cells that lie outside the brain case or spinal vertebrae. Sensory receptors detect changes in the external environment (visual, auditory, olfactory, sensory, etc.) and communicates them to the CNS (via afferent sensory nerves).ntroduction The nervous system is itself divided into two sections: The Peripheral Nervous System (PNS): sensory receptors and motor effectors The Central Nervous System (CNS): Brain and spinal cord In summary, the nervous system is organized as follows: