Neuro: Blood Supply To Brain And Spinal Cord

Front 1

all blood supply to the brain are supplied from....

Back 1

aa. off internal carotid (anterior blood supply) and off vertebral a (posterior blood supply)

Front 2

where does the AICA come off? what does it branch off of?

Back 2

comes of basilar a. at pontomedullary jxn

Front 3

at what level does the posterior cerebral a. enter the brain?

Back 3

midbrain

Front 4

what connects the anterior and posterior blood supplies?

Back 4

posterior comunicating a.

Front 5

2 complications of aneurysms

Back 5

compress brain tissue
rupture-> subarachnoid hemorrhage

Front 6

what does the anterior cerebral a. supply? (ACA)

Back 6

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

Front 7

aneurysm in the ACA might cause what deficit? why?

Back 7

loss of somatosensory and motor in the contralateral leg; ACA supplies paracentral lobule

Front 8

what does the PCA supply?

Back 8

occipital lobe and inferior and medial regions of temporal lobe

Front 9

aneurysm of the PCA might elicit what deficit?

Back 9

loss of one visual cortex(contralateral)
stroke in L PCA -> loss of visual info from right side of each visual field (contralateral homonymous hemianopia)

Front 10

what does the MCA supply?

Back 10

lateral surface of hemisphere (portions of all lobes)
enters cortex thru sylvian fissure

Front 11

aneurysm of MCA might cause what deficit?

Back 11

loss of motor and somatosensory to contralateral face and arm

Front 12

what are some important branches off the MCA? where do they run and what are some areas they supply?

Back 12

lenticulostriate arteries; penetrate deep to supply basal ganglia and internal capsule
come off before MCA splits into superior and inferior divisions which supply laterally

Front 13

what is the internal capsule?

Back 13

large bundle of white fibers that are axons (UMN) funneling down from the motor cortex

Front 14

which aa supplying the brain is most likely to undergo infarct or ischmic injury?

Back 14

MCA

Front 15

infarction of the left MCA superior division results in what deficit?

Back 15

area: inferior frontal lobe
Broca's aphasia (language on L in 90% ppl)
also, weak faace, arm (upper motor neuron)

Front 16

stroke in right MCA stem

Back 16

area: R parietal lobe (spatial orientation)
left hemineglect
language fine
also lose contralateral motor (internal capsule)

Front 17

what are watersheds? why are they of clinical importance?

Back 17

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

Front 18

what would happen with loss of flow to the ACA- MCA watershed?

Back 18

"man in the barrel"
TRUNK not supplied (between medial and lateral regions of homunculus)

Front 19

what does the PICA supply?

Back 19

medulla and cerebellum
common for strokes

Front 20

AICA supply?

Back 20

pons and cerebellum

Front 21

superior cerebellar a supply?

Back 21

midbrain and cerebellum

Front 22

anterior spinal a supply?

Back 22

ant (2/3) spinal cord and medial medulla

Front 23

blood supply of spinal cord

Back 23

anterior spinal a (1)
and posterior spinal aa. (2)-one on each side

Front 24

what do the post spinal aa supply?

Back 24

post 1/3

Front 25

how does all venous blood drain from the brain?

Back 25

internal jugular v.

Front 26

what are 3 large vv that dump into the internal jugular v?

Back 26

cavernous sinus, superior sagital sinus, great v of galen