Sensory II Flashcards
ALS relays what sensations from teh body
nociceptive*
thermal*
non-discriminative touch
pressure and propriocention
ALS contains what ascending tracts
anterior spinothalamic
lateral spinothalamic tract
where is antertior spinothalamic tract lcoated
inanterior funciculus or anterior aspect of spinal cord
what does anterior spinothalamic tract look like
delicate, thin
where is lateral spinothalamic tract located
ventrolateral/anteriolateral aspect of lateral funiculus
what does lateral spinothalamic tract look like
more prominent
main tract
what are the minor tracts of the ALS
spinorecitcular
spinomesncephalic
spinotectal
spinohypothalamic
whre is spinomesencephalic tract located
ascends from teh spinal cord up to periaquaductual gray matter
where is spinotectal tract located
ascends to superior colliuclus
path of spinothalamic tract
spinal cord to thalamus to sensory cortex
neospinothalmic system
direct pathways, brings sensory info directly to VPL nucleus of thalamus
paleospinothalamic system consistsna mainly of what
spinoreticular tract
path of paleospinothalamic system
spinal cord to RF to thalamus to hypothalamus, limbic cortex
does most of information carried by paleospinothalamic system enter consciousnes?
no
function of neospinothalamic system
brings fast, sharp, well colazied pain sensation to consciousness
what type of pathways is neospinothalmic
3 neuron
where is neuron I cell body
DRG
where is neuron II cell body
dorsal horn
where is neuron III cell body
VPL of thalamus
nucleus proprius contains what
cell bodies of neurons whose axons cross in the ventral white commissure and then form teh spinothalamic tracts
where do peripheral process terminate
as free nerve ending in skeletal muscle, skin, ten, ligam, joint capsule, periosteum, bone or visceral structure
alphadelta fiber
lightly myelinated, has a small diameter
how do central process of neuron enter spinal cord
via dorsal root of spinal neur
what happens when central process enters white matter
bifurcates into short ascending and short descending branch in the dorsolateral tract of lissaur
dorsolateral tract of lissauer
does not have long ascending or desending axons,
where do ascending and descending branches synpase
substantia gelatinosa
function of substantia gelatinosa
modulation of nociception
nucelus proprius consists of neurons housed wehre
in rexed laminae IV, V
what does spinothalmic tract arise from
nucleus proprius
in the pain pathways teh cell bodies of second order neurons are located where
dorsal horn of all levels of spinal cord
reticular formation
inovled in reflexes, awakening, alertness, motor activity
what happens with 3rd order neurons as they ascend
go through corona radiata and internal capsule and terminate in primary somatosensory cortex
what happens to 2nd order neurons on their way to the thalamus
give off collateral branches that terminate in reticular formation
function of medial aspect of primary somatosensory cortex
process sensory info from lower limb
