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17 Cards in this Set
- Front
- Back
define the four levels of consciousness
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1. Awake-maintain w/o stimulation 2. Sleepy-arousable but needs stimulation, can maintain 3. stupor-arousable but unable to maintain wakefullness w/o continuous stim 4. coma-unarousable with any stimulation
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diminished level of consciousness indiactes a lesion ...
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reticular activating system
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distinguish between a metabolic and structural coma, lesions?
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metabolic-bilateral cerebral hemispheres, cause=low glucose, oxygen, drugs;
strutural-lesion in brainstem or bilateral thalami or bilateral hemispheres, cause=stroke, tumor |
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global aphasia might becaue by occulsion in which artery
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MCA (supplies peri-slyvian area)
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which hemisphere supplies attention to the right
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Both parietal lobes
the right parietal lobe contributes bilateral attention L>R (lesion=severe neglect of left) the left parietal lobe contribues right attention (lesion=mild neglect of right) |
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which hemisphere supplies bilateral attention
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right parietal lobe
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which parietal lobe is more important for spatial attention
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right parietal lobe
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how will a lesion of the right parietal lobe affect spatial attention
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severe neglect of the left, R. hemisphere contributes bilateral attention L>R
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how will a lesion of teh left parietal lobe affect spatial attention
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mild neglect of the right
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A pt with eyes to the left and right hemiparesis has a lesion
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Left cortex. Hypoactive left eye field means eyes get pushed left, damage to left motor cortex gives right hemiparesis
"right way eyes" |
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Primary sensation detects basic touch, temp, vibation. What does cortical sensation contribute
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where? what? (loss=agraphesthesia, asterognosis)
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A lesion to the cortical sensory areas in the contralateral parietal lobe can result in
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agraphesthesia (writing on palm), astereognosis (can't tell what it is)
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A homonymous vistual defect suggests a lesion...
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posterior to the optic chiasm (same in both eyes)
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How does the "congruity" of a VFD relate to ant-post orientation
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the more anterior the more incongrous
the more posterior the more congrous |
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describe the "visiotopy" of the occipital lobe
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posterior-central field, anterior-peripheral field
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occlusion of the PCA can lead to R. or L. hemianopia. Why is the macula often spared
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collateral flow to the posterior occipital tip by the MCA
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congruity of a VFD suggests a lesion is more ant/post
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posterior
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