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Electrophysical Agents: Physiology of pain and pain gating · Nociceptors and Pain Pathways

How nociceptors detect harm, which fibers and pathways carry pain signals, and how injury sensitizes them.

For learning, not medical advice: for your own health, ask a doctor or another qualified professional.

Electrophysical Agents · 25 questions

Try 3 questions

1. What does 'nociception' mean, as distinct from the experience of pain?

  1. The emotional memory of past injuries
  2. The conscious feeling of unpleasant sensation
  3. Neural encoding of potentially harmful stimuli
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Answer: Neural encoding of potentially harmful stimuli

Nociception is the detection and transmission of noxious signals by the nervous system; pain is the brain's conscious experience, and each can occur without the other.

2. Structurally, what kind of sensory receptor is a nociceptor?

  1. A free, unencapsulated nerve ending
  2. A specialized hair cell in the skin
  3. An encapsulated ending like a Pacinian corpuscle
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Answer: A free, unencapsulated nerve ending

Nociceptors are bare, free nerve endings of thin sensory fibers, unlike touch receptors that are wrapped in capsules or associated with specialized cells.

3. The sharp, well-localized 'first pain' after stubbing a toe is carried mainly by which fibers?

  1. A-delta fibers
  2. C fibers
  3. A-beta fibers
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Answer: A-delta fibers

Thinly myelinated A-delta fibers conduct relatively fast, delivering a quick, sharp and precisely located pain before the slower C-fiber signal arrives.

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