140 & 142 Somatosensory 1 and 2 Flashcards
Somatic sensation, visceral sensation, and olfaction have _________ axons
long
gustation, photoreception, hair cells (special senses) have ________ axons
short
tactile mechanoreceptors detect
light touch, heavy touch, vibration
detects shapes and surfaces
meissners
detects tactile indentations like braile
merkel disks
detects stretches
ruffini
detects vibrations
pacinian corpurscle
are meisner, ruffini, pacinian encapsulated or nonencapsulated
encapsulated Ad myelinated fibers
where are meissners primarily found
fingers, palms, ties, soles
where are merkels primarily found
lips, genitals, fingers
where are pacinian primarily found
hands, feet, genitals
sensation coming from below T6 follows what tract
fasciculus gracilis
what is the pathway for sensations
sensation, DRG, fasciculus, synapse at lower medulla and cross, VPL Thalamus, synaps, sensorimotor cortex
anterior spinocerebellar tract is used for
proprioception, crosses at pons
If you have an infarct of an artery supplying spinal cord on left side, how will it affect non conscious proprioception?
reduced muscle spindle and golgi tendon on left, and loss of right leg proprioception of right
where do dorsolateral tract fibers synapse
substantia gelatinosa and principal sensory nucleus
where do neospinothalamic tract cross
lateral funiculus
cold stimulus uses ______, heat uses ______
Ad, C
what centers mediate pain
periaqueductal grey matter and locus ceruleus
what do enkephalins do
surpress pain
injury in spinothalamic tract causes
loss of pain and thermal sensation to contralateral side
a lesions to primary somatosensory nucles or a thalamic lesion causes
loss of sensation to contralateral face and body
a lesion to lateral pontine or medullary lesion causes
loss of sensation to ipsilateral face and contralateral body
medial medullary lesion causes
loss of sensation to contralateral body
