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26 Cards in this Set
- Front
- Back
all blood supply to the brain are supplied from....
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aa. off internal carotid (anterior blood supply) and off vertebral a (posterior blood supply)
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where does the AICA come off? what does it branch off of?
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comes of basilar a. at pontomedullary jxn
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at what level does the posterior cerebral a. enter the brain?
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midbrain
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what connects the anterior and posterior blood supplies?
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posterior comunicating a.
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2 complications of aneurysms
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compress brain tissue
rupture-> subarachnoid hemorrhage |
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what does the anterior cerebral a. supply? (ACA)
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medial surface of the hemisphere
appears anterior to hypothal and moves around genu of corpus callosum; moves caudally along corpus callosum and overlaps with PCA near parietal-occipital fissure |
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aneurysm in the ACA might cause what deficit? why?
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loss of somatosensory and motor in the contralateral leg; ACA supplies paracentral lobule
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what does the PCA supply?
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occipital lobe and inferior and medial regions of temporal lobe
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aneurysm of the PCA might elicit what deficit?
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loss of one visual cortex(contralateral)
stroke in L PCA -> loss of visual info from right side of each visual field (contralateral homonymous hemianopia) |
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what does the MCA supply?
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lateral surface of hemisphere (portions of all lobes)
enters cortex thru sylvian fissure |
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aneurysm of MCA might cause what deficit?
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loss of motor and somatosensory to contralateral face and arm
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what are some important branches off the MCA? where do they run and what are some areas they supply?
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lenticulostriate arteries; penetrate deep to supply basal ganglia and internal capsule
come off before MCA splits into superior and inferior divisions which supply laterally |
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what is the internal capsule?
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large bundle of white fibers that are axons (UMN) funneling down from the motor cortex
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which aa supplying the brain is most likely to undergo infarct or ischmic injury?
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MCA
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infarction of the left MCA superior division results in what deficit?
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area: inferior frontal lobe
Broca's aphasia (language on L in 90% ppl) also, weak faace, arm (upper motor neuron) |
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stroke in right MCA stem
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area: R parietal lobe (spatial orientation)
left hemineglect language fine also lose contralateral motor (internal capsule) |
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what are watersheds? why are they of clinical importance?
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regions between ACA and MCA and b/w MCA and PCA;
drops in BP affect these areas most since they are at the distal end of the vessels; decrease flow to watersheds |
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what would happen with loss of flow to the ACA- MCA watershed?
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"man in the barrel"
TRUNK not supplied (between medial and lateral regions of homunculus) |
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what does the PICA supply?
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medulla and cerebellum
common for strokes |
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AICA supply?
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pons and cerebellum
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superior cerebellar a supply?
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midbrain and cerebellum
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anterior spinal a supply?
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ant (2/3) spinal cord and medial medulla
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blood supply of spinal cord
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anterior spinal a (1)
and posterior spinal aa. (2)-one on each side |
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what do the post spinal aa supply?
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post 1/3
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how does all venous blood drain from the brain?
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internal jugular v.
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what are 3 large vv that dump into the internal jugular v?
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cavernous sinus, superior sagital sinus, great v of galen
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