Which type of nerve fiber is responsible for sharp pain and temperature sensation?

Which type of nerve fiber is responsible for sharp pain and temperature sensation?

• A. A-alpha
• B. A-gamma
• C. A-delta
• D. C

Answer: (C)

Sharp, well-localized pain is carried by thinly myelinated A-delta fibers that conduct signals quickly, allowing you to pinpoint the source of the pain and respond rapidly. These fibers also carry cold temperature information, which aligns with the quick, precise sensation described. In contrast, large myelinated fibers (A-alpha and A-beta) handle motor control and fine touch, and a different motor fiber (A-gamma) serves muscle spindle innervation. Unmyelinated C fibers transmit slower, dull, diffuse pain and are more associated with warm temperature sensation. So for the combination of sharp pain and temperature sensation, the responsible fiber type is A-delta.

Sharp, well-localized pain is carried by thinly myelinated A-delta fibers that conduct signals quickly, allowing you to pinpoint the source of the pain and respond rapidly. These fibers also carry cold temperature information, which aligns with the quick, precise sensation described. In contrast, large myelinated fibers (A-alpha and A-beta) handle motor control and fine touch, and a different motor fiber (A-gamma) serves muscle spindle innervation. Unmyelinated C fibers transmit slower, dull, diffuse pain and are more associated with warm temperature sensation. So for the combination of sharp pain and temperature sensation, the responsible fiber type is A-delta.