KINESIOL 2G03 Study Guide - Midterm Guide: Posterior Grey Column, Frontal Lobe, Nociceptor
6 Apr 2017
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C fibres are nociceptor fibres, which carry pain information. Activity in c- fibres for sustained pinch, stronger more intense pinch reduces activation of c-fibres, once noxious pinch is removed c fibres slowly become more active. Not just ascending signals that modulate pain perception also descending that come: pag becomes activated from more intense pain. Pag activation causes the from pag in midbrain release of pain relievers (endogenous opioid release in body: pag sends neurons down to nucleus ralph magnus. Nrm in midbrain releases serotonin onto inhibitory interneuron found in dorsal horn of spinal cord. The ascending and descending happen in parallel. Elevates threshold through which the pain systems have to be activated (c-fibres) symbols) body can get ready to experience pain and modulate thresholds even before pain has been experienced. Noxious pain body says there"s other pain going on i can"t register new intense pain, Norepinephrine that comes from locus coreulus, when we increase stress we opioids decrease pain.
