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ANTOMY & PHYSIOLOGY OF PAIN
Transcript of ANTOMY & PHYSIOLOGY OF PAIN
nociception & pain
definition & descriptor terminology
A commonly used definition describes pain as an unpleasant sensory and emotional experience associated with actual or potential tissue damage or described in terms of such damage.
A revised definition identifies pain as "a somatic perception containing:
(1) a bodily sensation with qualities like those reported during tissue-damaging stimulation,
(2) an experienced threat associated with this sensation, and
(3) a feeling of unpleasantness or other negative emotion based on this experienced threat" .
free nerve ending
C - fiber
A- delta fiber
Pain descriptor terminology
PHYSIOLOGY OF PAIN
Hyperalgesia — Increased response to a stimulus that normally is painful.
Hypoalgesia — Diminished response to a normally painful stimulus.
Analgesia — Absence of pain in response to stimulation that normally is painful.
Hyperesthesia — Increased sensitivity to stimulation, excluding the special senses.
Hypesthesia — Diminished sensitivity to stimulation, excluding the special senses.
Dysesthesia — An unpleasant abnormal sensation, whether spontaneous or evoked.
Paresthesia — An abnormal sensation, whether spontaneous or evoked.
Allodynia — Pain resulting from a stimulus (such as light touch) that does not normally elicit pain.
Wide dynamic range(WDR)
descending pain control mechanism