Sensation of Pain and Temperature Flashcards
modality with free nerve endings, group IV unmyelinated
deep pain (nociceptors)
modality with free nerve endings, group III myelinated
pricking pain (nociceptors)
type of pain nociceptor with poorly localized, wide receptive fields
deep pain
type of pain nociceptor with well localized, smaller receptive fields
pricking pain
what types of nerve ending(s) does temperature (thermoreceptors) have?
distinct cool (III) and warm (IV) endings
nerve ending type III is
small, myelinated
nerve ending type IV is
small, unmyelinated
light “crude” touch has what nerve ending type(s)?
groups III and IV
thresholds are low for:
touch, temperature
thresholds are high for
pain
physiological process for transduction caused by tissue damage
tissue damage releases intracellular materials (e.g. K+) which depolarizes nociceptor
for pain and temp, where are the cell bodies of primary afferents?
dorsal root ganglia
first synapse of pain and temp pathways are in the
spinal cord dorsal horn
pain and temp pathway 2nd synapse
VPL of thalamus
pain and temp pathway 3rd synapse
cortex (parietal lobe, areas 3,2,1)