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-beta, C-fiber
• C. A-delta, A-beta
• D. A-alpha, C-fiber

Answer: (A)

The main concept here is the two types of nerve fibers that carry pain signals from tissue to the spinal cord. Pain is transmitted primarily by A-delta fibers and C fibers. A-delta fibers are thinly myelinated and conduct quickly, producing a sharp, well-localized quick pain right after injury. C fibers are unmyelinated and conduct slowly, delivering a dull, aching, longer-lasting pain that follows the initial sharp sensation. This difference in conduction speed explains why you feel a sharp pain first and then a slower, throbbing pain. Other fiber types like A-beta and A-alpha are responsible for touch/vibration and motor/proprioception, respectively, and are not the primary pain carriers. Therefore, the two pain-carrying fibers are A-delta and C fibers.

The main concept here is the two types of nerve fibers that carry pain signals from tissue to the spinal cord. Pain is transmitted primarily by A-delta fibers and C fibers. A-delta fibers are thinly myelinated and conduct quickly, producing a sharp, well-localized quick pain right after injury. C fibers are unmyelinated and conduct slowly, delivering a dull, aching, longer-lasting pain that follows the initial sharp sensation. This difference in conduction speed explains why you feel a sharp pain first and then a slower, throbbing pain. Other fiber types like A-beta and A-alpha are responsible for touch/vibration and motor/proprioception, respectively, and are not the primary pain carriers. Therefore, the two pain-carrying fibers are A-delta and C fibers.