試題詳解

3. Which one of the following statements is wrong?
(A) All nociceptors are myelinated.
(B) Following a cutaneous injury, enhanced pain in response to cutaneous stimuli, called hyperalgesia, develops at the site of injury (primary hyperalgesia) and in the surrounding uninjured skin (secondary hyperalgesia).
(C) Tissue injury leads to enhanced responsiveness of nociceptors, called sensitization, which accounts for primary hyperalgesia.
(D) When nerves are severed, spontaneous activity and ectopic mechanical, thermal, and chemical sensitivity develop in the injured nociceptors.