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25 Cards in this Set
- Front
- Back
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major site of termination of VPL and VPM axons?
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primary somatosensory cortex (SI)
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the foot and leg are represented in what part of SI?
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contralateral posterior paracentral lobule
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the trunk, chest, arm, and hand are represented in what part of SI?
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upper half of contralateral postcentral gyrus
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the face is represented in what part of SI?
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lower half of contralateral postcentral gyrus
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where (anatomically) is the secondary cortical receiving area (SII)?
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pars opercularis
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what does a lesion to SII produce?
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learning deficits by object manipulation and in texture/size recognition
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the somatosensory association cortex is located where?
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posterior parietal cortex
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lesions to the somatosensory association cortex result in what?
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neglect, inattention to stimuli contralateral to lesion
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inputs for lemniscal info to limbic circuitry are (direct/indirect)?`
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indirect
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spinothalamic info to limbic circuitry is (direct/indirect)?
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direct
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symptoms of peripheral nerve damage?
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complete sensory loss, range of motor loss, discrete area, not dermatomal
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symptoms of dorsal nerve root damage?
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complete sensory loss, no motor loss, dermatomal area
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symptoms of dorsal column lesion?
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loss of touch/vibration/position sensation below lesion, ipsilateral loss, POS romberg, other sensations will be normal
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symptoms of spinothalamic tract lesion?
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loss of pain/temp sensation below lesion, contralateral loss, NEG romberg, other sensations will be normal
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what kind of lesion is involved with Brown-Sequard syndrome?
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combined dorsal column & spinothalamic lesion
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symptoms of Brown-Sequard syndrome?
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double modality loss below lesion: loss of touch/vibration/proprioception ipsilateral to lesion and loss of pain/temperature contralateral to lesion
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what is a syringomyelia?
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bilateral segmental spinothalamic lesion
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symptoms of syringomyelia?
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bilateral loss of pain/temp sensations limited to band of body (only affects decussating spinothalamic fibers)
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what 3 major tracts can be affected by brain stem damage?
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spinothalamic tract, dorsal column tract, spinal trigeminal tract (from face)
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all somatosensory pathways are crossed above where?
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pons
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what causes Wallenberg's Syndrome?
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PICA infarct at lateral medulla
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what tract does Wallenberg's damage?
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spinothalamic tract & spinal trigeminal tract
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what are the symptoms of Wallenberg's?
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loss of pain/temp sensation from contralateral body and ipsilateral face
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symptoms of somatosensory cortex damage?
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complex, contralateral sensory loss, no pain loss, motor deficits
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where is the pain cortex located?
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insula
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