Lec 7 - Pain Pathways Flashcards
small myelinated free nerve endings
a delta fibers
small nonmyelinated nerve endings
c fibers
delta fibers are more blank than c fibers
localized pain
local anesthetics block these first
nonmyelinated fibers
partial nerve transection/damage causes severe burning pain called blank
causalgia
pain and temperature sensation are transmitted via the blank division of the spinal cord
lateral
where the pain and temperature sensation enter the lateral division of the spinal cord via the posterior horn
lisauer tract
pain pathway
neurons of lamina 1, dendrites in substantia gelatinosa, small interneurons of s. gelatinosa
interneurons allow for the blank of pain
modulation
pain and temperature neurons cross over blank
almost immediately
somatotopic organization of spinal cord has lower body neurons located blank but upper body neurons located blank
posterolateral, anterior
three subdivisions of anterolateral pathway
spinothalamic tract, spinoretricular tract, spinomesencephalic tract
spinothalamic tract is very preciselyblank
localized
spino thalamic tract deals more with blank fibers
delta
spinoreticular tract deals with blank fibers
c
spinoreticular tract lacks blank arrangement
somatotopic
tract of anterolateral pathway that has a role in pain control
spinomesencephalic
spinomesencephalic tract only makes it up to reach this structure
periaqueductal gray of midbrain
spinothalamic tract is directly lateral to blank
medial lemniscus
spinoreticular tract is directly medial to blank
reticular formation
3 functions of reticular formation
arousal by sensory info, consciousness, modulation of pain
NT made by raphe nuclei
serotonin
serotonin blank pain via spinothalamic neurons
suppresses
depressed people feel more blank because of less blank
pain, serotonin
