Which neuron serves as a myelinated acute self-limiting nociceptor?

Which neuron serves as a myelinated acute self-limiting nociceptor?

• A. A alpha
• B. A beta
• C. A delta
• D. C fiber

Answer: (C)

A-delta fibers carry the fast, sharp, well-localized pain that appears immediately after a noxious stimulus and tends to fade quickly when the stimulus is removed. They are thinly myelinated, which speeds their conduction compared to unmyelinated fibers, giving you that rapid “first pain” sensation and precise localization. This makes them ideal for signaling acute, self-limiting pain. In contrast, C fibers are unmyelinated and transmit slower, dull, lingering pain; A-alpha and A-beta fibers are large and primarily convey motor signals or non-nociceptive touch and proprioception, not nociception. So, the myelinated acute self-limiting nociceptor is the A-delta fiber.

A-delta fibers carry the fast, sharp, well-localized pain that appears immediately after a noxious stimulus and tends to fade quickly when the stimulus is removed. They are thinly myelinated, which speeds their conduction compared to unmyelinated fibers, giving you that rapid “first pain” sensation and precise localization. This makes them ideal for signaling acute, self-limiting pain. In contrast, C fibers are unmyelinated and transmit slower, dull, lingering pain; A-alpha and A-beta fibers are large and primarily convey motor signals or non-nociceptive touch and proprioception, not nociception. So, the myelinated acute self-limiting nociceptor is the A-delta fiber.