Neuro 50: Localization Of Cortical Dysfunction

Front 1

define the four levels of consciousness

Back 1

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

Front 2

diminished level of consciousness indiactes a lesion ...

Back 2

reticular activating system

Front 3

distinguish between a metabolic and structural coma, lesions?

Back 3

metabolic-bilateral cerebral hemispheres, cause=low glucose, oxygen, drugs;

strutural-lesion in brainstem or bilateral thalami or bilateral hemispheres, cause=stroke, tumor

Front 4

global aphasia might becaue by occulsion in which artery

Back 4

MCA (supplies peri-slyvian area)

Front 5

which hemisphere supplies attention to the right

Back 5

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)

Front 6

which hemisphere supplies bilateral attention

Back 6

right parietal lobe

Front 7

which parietal lobe is more important for spatial attention

Back 7

right parietal lobe

Front 8

how will a lesion of the right parietal lobe affect spatial attention

Back 8

severe neglect of the left, R. hemisphere contributes bilateral attention L>R

Front 9

how will a lesion of teh left parietal lobe affect spatial attention

Back 9

mild neglect of the right

Front 10

A pt with eyes to the left and right hemiparesis has a lesion

Back 10

Left cortex. Hypoactive left eye field means eyes get pushed left, damage to left motor cortex gives right hemiparesis
"right way eyes"

Front 11

Primary sensation detects basic touch, temp, vibation. What does cortical sensation contribute

Back 11

where? what? (loss=agraphesthesia, asterognosis)

Front 12

A lesion to the cortical sensory areas in the contralateral parietal lobe can result in

Back 12

agraphesthesia (writing on palm), astereognosis (can't tell what it is)

Front 13

A homonymous vistual defect suggests a lesion...

Back 13

posterior to the optic chiasm (same in both eyes)

Front 14

How does the "congruity" of a VFD relate to ant-post orientation

Back 14

the more anterior the more incongrous
the more posterior the more congrous

Front 15

describe the "visiotopy" of the occipital lobe

Back 15

posterior-central field, anterior-peripheral field

Front 16

occlusion of the PCA can lead to R. or L. hemianopia. Why is the macula often spared

Back 16

collateral flow to the posterior occipital tip by the MCA

Front 17

congruity of a VFD suggests a lesion is more ant/post

Back 17

posterior