Cerebral blood supply Flashcards
anterior cerebral artery supplies which lobe
Frontal lobe medial portion
Medial parietal lobe
anterior cerebral artery affects which functions
Motor and sensory function, lower limb more than upper limb
Personality changes if the occlusion of this artery causes a lesion
middle cerebral artery supplies which lobes
Lateral frontal and parietal and temporal
middle cerebral artery affects these functions
Motor and sensory function
Of upper limb more than lower limb
potential for language impairment on the left side
visual spatial relationship impairments on the right side
Supplies areas of optic radiations
Posterior cerebral artery supplies, which lobes
Medial temporal lobe and occipital lobe
posterior cerebral artery infarct can affect
Vision; cortical blindness
Loss of deep branches could affect the supply to diencephalon and hippocampus
Potentially resulting in
contralateral hemi sensory loss
flaccid Hemoparesis and declarative memory loss
Homunculus placement
medial is lower limb
lateral is upper limb
visiuospatial deficit is expected from an infarct due to occlusion of which artery
MCA
left MCA superficial division infarct
Right face and arm weakness and sensory loss
Brocas aphasia
wernickes aphasia
Contralateral homonymous hemianopia
right MCA superficial division infarct
left face and arm weakness and sensory loss
Left hemi neglect
visuospatial deficits
Impairment of nonverbal communication
left MCA lenticulaostriate (deep) branches infarct
right hemiparesis due to damage to basal ganglia and to the internal capsule
right MCA lenticolostriate branches
Left hemiparesis due to damage to basal ganglia and to the internal capsule
Right homonymous hemianopia is a symptom of which artery being occluded
Left PCA
left PCA infarct
right homonymous hemianopsia due to damage in visual cortex
Extension to splenium of corpus callosum interfering with communication between visual association areas can cause Alexia without agraphia
Larger infarcts involving the internal capsule and thalamus may cause right hemi sensory loss and right hemi paresis
right pca infarct
left homonymous hemianopsia
left hemisensory loss
left hemiparesis
behavioral abnormalities from which artery infarct
ACA
frontal lobe
left aca infarct
right LE weakness due to damage to motor cortex
Right LE cortical sensory loss due to damaged sensory cortex
Frontal lobe behavior abnormalities
TransCortical aphasia, prefrontal, cortex or supplemental motor areas are involved.
right ACA infarct
left LE weakness
left Le cortical sensory loss
grasp reflex
frontal lobe behavior abnormalities
Left hemineglect if prefrontal and nondominant association cortex involved
ischemic stroke
blood flow obstructed by thrombus or embolus
Common type of stroke
MCA most common
embolic strokes
Typically result in abrupt onset of symptoms and recovery can occur most rapidly in the first couple of weeks
Thrombotic strokes
May also be abrupt, or they can have a more gradual onset with slower, recovery, and more residual deficits
hemorrhagic strokes
Can have multiple detrimental effects on brain tissue
The blood supply downstream is interrupted due to the hemorrhage
The extravasated blood in the brain tissue can put pressure on the surrounding tissue
Blood can have cytotoxic effects on the brain tissue
Onset of symptoms and improvement typically occurs after the extravascular blood is removed in the edema resolves
subcortical white matter lesions
Most common with damaged arteries of the internal capsule
Extreme effects due to bundling of high concentration of axons and tracks
possible effects from subcortical white matter lesions
Contralateral decrease in volitional movement
Contralateral loss of conscious somatosensation
if Optic radiations involved, contralateral vision field loss
thalamic lesions
involve the relay nuclei, which interrupt ascending pathways
Compromise contralateral sensation
Proprioception most affected
Common with Parkinson’s thalamic stroke, or brain injury
lateropulsion
pusher syndrome
damage to right posterior thalamus
Pushing away from the less paretic side and sitting during transfers and standing and with walking
Pushing towards the hemiparetic side
