Electrical stimulation influences which nerve pathways?

• A. Efferent pathways only
• B. Afferent pathways only
• C. Both efferent and afferent pathways
• D. Neither pathway

Answer: (C)

Electrical stimulation engages both efferent and afferent pathways. Nerves carry motor fibers that send commands from the CNS to muscles and sensory fibers that bring information from the periphery back to the CNS. When a current is applied to a peripheral nerve, it can depolarize nearby fibers, and because many fiber types are present with different thresholds, both motor (efferent) and sensory (afferent) fibers are often activated. Activating motor fibers produces muscle contraction, while activating sensory fibers sends signals toward the spinal cord and brain, influencing perception, reflexes, and pain modulation. So, the overall effect of electrical stimulation is to influence both pathways, though some applications may emphasize one pathway more than the other depending on the protocol.