C-fibres are:

C-fibres are:

• A. Myelinated fast pain fibers
• B. Unmyelinated fibers that carry slow, dull, poorly localized pain
• C. Fibers carrying sharp pain
• D. Fibers that transmit temperature only

Answer: (B)

Pain signals come from different nerve fibers that differ in insulation, speed, and the way they feel. C-fibers are unmyelinated and small in diameter, so they conduct impulses slowly. This slow conduction produces the dull, burning, lingering pain that is poorly localized. It contrasts with the fast, sharp pain carried by myelinated A-delta fibers, which are quick and well localized. Temperature sensations involve multiple fiber types and aren’t limited to one fiber class, and C-fibers aren’t defined as carrying only temperature. So the description that matches C-fibers is that they are unmyelinated fibers that carry slow, dull, poorly localized pain.

Pain signals come from different nerve fibers that differ in insulation, speed, and the way they feel. C-fibers are unmyelinated and small in diameter, so they conduct impulses slowly. This slow conduction produces the dull, burning, lingering pain that is poorly localized. It contrasts with the fast, sharp pain carried by myelinated A-delta fibers, which are quick and well localized. Temperature sensations involve multiple fiber types and aren’t limited to one fiber class, and C-fibers aren’t defined as carrying only temperature. So the description that matches C-fibers is that they are unmyelinated fibers that carry slow, dull, poorly localized pain.