What are the two types of pain nerve fibers?

What are the two types of pain nerve fibers?

• A. A-delta, C-fiber
• B. A-alpha and A-beta
• C. A-delta and A-beta
• D. C-fiber and A-gamma

Answer: (A)

Pain is carried by two main nerve fiber types: A-delta fibers and C fibers. A-delta fibers are small but myelinated, so they conduct quickly and deliver a fast, sharp, well-localized pain that appears right after a noxious stimulus. C fibers are unmyelinated and conduct more slowly, producing a dull, aching, longer-lasting pain that’s harder to localize. The difference in myelination and conduction speed explains why you first feel a quick sharp sensation and then a throbbing or lingering ache. This distinction helps therapists understand and tailor pain relief approaches, since these fibers contribute to different pain qualities and timing. Other fiber types (like A-beta or A-alpha) relate to touch or motor functions, not the primary nociceptive signals described here.

Pain is carried by two main nerve fiber types: A-delta fibers and C fibers. A-delta fibers are small but myelinated, so they conduct quickly and deliver a fast, sharp, well-localized pain that appears right after a noxious stimulus. C fibers are unmyelinated and conduct more slowly, producing a dull, aching, longer-lasting pain that’s harder to localize. The difference in myelination and conduction speed explains why you first feel a quick sharp sensation and then a throbbing or lingering ache. This distinction helps therapists understand and tailor pain relief approaches, since these fibers contribute to different pain qualities and timing. Other fiber types (like A-beta or A-alpha) relate to touch or motor functions, not the primary nociceptive signals described here.