Blood Supply

Question 1

falx cerebri

Answer 1

dural fold between cerebral hemispheres

Question 2

falx cerebelli

Answer 2

dural fold between cerebellar hemispheres

Question 3

tentorium cerebelli

Answer 3

dural fold between cerebral & cerebellar hemispheres

Question 4

the thalamostriate and choroidal veins join to form the ____

Answer 4

internal cerebral vein

Question 5

the left and right internal cerebral veins join to form the ____

Answer 5

great cerebral vein of Galen

Question 6

the great cerebral vein of Galen continues to form the ____

Answer 6

straight sinus

Question 7

what is the circle of willis?

Answer 7

site of overlapping blood supply from 2 systems of arteries (internal carotid & vertebrobasilar aa) connected via the posterior and anterior communicating aa

Question 8

describe the path of the internal carotid arteries

Answer 8

• arise from common carotid aa
• enter skull through carotid canals
• traverse the cavernous sinus
• divide into anterior & middle cerebral aa

Question 9

describe the path of the vertebral arteries

Answer 9

• arise from subclavian aa at level of pons
• join to form basilar a
• give off posterior inferior cerebellar aa

Question 10

name the branches of the basilar artery

Answer 10

• anterior inferior cerebral a
• pontine aa (form the labyrinth, travelling w/ CN VIII to ear)
• superior cerebellar a

Question 11

the ____ originates from the posterior cerebral artery

Answer 11

posterior choroidal a

Question 12

the posterior communicating artery joins what 2 arteries?

Answer 12

posterior cerebral a
internal carotid a

Question 13

what arteries perforate the anterior perforated substance?

Answer 13

lenticulostriate aa
recurrent a of Heubner

Question 14

the lenticulostriate arteries originate from the ____

Answer 14

middle cerebral a

Question 15

the anterior choroidal artery originates from the ____

Answer 15

internal carotid a

Question 16

the recurrent artery of Heubner originates from the ____

Answer 16

anterior cerebral a

Question 17

the anterior communicating artery joins what 2 arteries?

Answer 17

bilateral anterior cerebral aa

Question 18

the brain constitutes ____% of total body weight

Answer 18

2

Question 19

the brain receives ____% of total cardiac output, and consumes ____% of oxygen utilized in the body

Answer 19

15
20

Question 20

what are the 2 ways that cerebral arterioles are capable of autoregulating?

Answer 20

1. dilate when systemic pressure drops, or arterial [CO2] raises (hypercarbia)
2. constrict when systemic pressure increases, or arterial [CO2] decreases