Which pair are pain nerve fibers according to the material?

Which pair are pain nerve fibers according to the material?

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

Answer: (A)

Pain signals are carried by two main types of nerve fibers: A-delta fibers and C fibers. A-delta fibers are thinly myelinated, so they conduct quickly and transmit the initial sharp, localized pain. C fibers are unmyelinated and slower, carrying the dull, lingering ache that follows. Together, they explain the distinct timing and quality of pain you experience after an injury. Other fiber types handle different bodily sensations. A-alpha and A-beta fibers mainly deal with motor commands and touch/proprioception, not pain. A-delta and A-beta would mix pain with touch signals, which isn’t accurate for pain-specific transmission. A-gamma fibers are motor-related, not primary pain fibers. Therefore, the pair that represents pain nerve fibers is A-delta and C fibers.

Pain signals are carried by two main types of nerve fibers: A-delta fibers and C fibers. A-delta fibers are thinly myelinated, so they conduct quickly and transmit the initial sharp, localized pain. C fibers are unmyelinated and slower, carrying the dull, lingering ache that follows. Together, they explain the distinct timing and quality of pain you experience after an injury.

Other fiber types handle different bodily sensations. A-alpha and A-beta fibers mainly deal with motor commands and touch/proprioception, not pain. A-delta and A-beta would mix pain with touch signals, which isn’t accurate for pain-specific transmission. A-gamma fibers are motor-related, not primary pain fibers. Therefore, the pair that represents pain nerve fibers is A-delta and C fibers.