Arterial Supply to CNS

Question 1

Label the circle of willis

Answer 1

Question 2

label blood supply to cerebrum

Answer 2

Question 3

what paired arteries are responsible for blood supply to the brain?

Answer 3

internl carotid
vertebral

Question 4

where do the internal carotid arteries originate?

Answer 4

bifurcation of left and right common carotid
levels of C4

Question 5

at what vertebral level do the internal carotid arteries arise?

Answer 5

C4

Question 6

where do the ICAs enter the brain?

Answer 6

carotid canal of temporal bone

Question 7

inside the cranial cavity, the ICAs pass anteriorly through what?

Answer 7

cavernous sinus

Question 8

list the 4 arteries each ICA gives rise to:

Answer 8

1. ophthalmic artery
2. posterior communicating artery
3. anterior choroidal artery
4. anterior cerebral artery

Question 9

the vertebral arteries arise from what other vessel?

Answer 9

subclavian arteries

Question 10

the vertebral arteries ascend how?

Answer 10

through posterior of neck via foramen transversarium

Question 11

what are foramen transversarium?

Answer 11

transverse processes of cervical vertebrae

Question 12

the vertebral arteries enter the cranial cavity through what?

Answer 12

the foramen magnum

Question 13

list 3 branches of the vertebral arteries within the cranial vault

Answer 13

1. meningeal branch
2. anterior and posterior spinal arteries
3. posterior inferior cerebellar artery

Question 14

after branching, the vertebral arteries converge to form what?

Answer 14

basilar artery

Question 15

how does the basilar artery terminate?

Answer 15

bifurcates into posterior cerebral arteries

Question 16

what does the ophthalmic artery supply?

Answer 16

structures of orbit

Question 17

what artery supplies the structures of orbit?

Answer 17

ophthalmic artery

Question 18

what does the anterior choroidal artery supply?

Answer 18

structures in the brain important for motor control and vision

Question 19

what artery supplies areas in the brain important for motor control and vision?

Answer 19

anterior choroidal artery

Question 20

what does the anterior cerebral artery supply?

Answer 20

part of the cerebrum

Question 21

after branching, the internal carotids continue as what?

Answer 21

middle cerebral arteries

Question 22

what does the middle cerebral artery supply?

Answer 22

lateral portions of cerebrum

Question 23

what does the meningeal branch supply?

Answer 23

falx cerebelli

Question 24

what supplies the falx cerebelli?

Answer 24

meningeal branch of vertebral arteries

Question 25

what do the anterior and posterior spinal arteries supply?

Answer 25

spinal cord

Question 26

the spinal cord is supplied by what branch of the vertebral arteries?

Answer 26

anterior and posterior spinal arteries

Question 27

the posterior inferior cerebellar artery supplies what?

Answer 27

cerebellum

Question 28

the cerebellum is supplied by what branch of the vertebral arteries?

Answer 28

posterior inferior cerebellar artery

Question 29

what two arterial systems does the circle of willis connect?

Answer 29

internal carotid arteries
vertebrobasilar systems

Question 30

what is the main function of the circle of willis?

Answer 30

provides collateral blood flow between anterior and posterior arterial systems of the brain + offers alternate blood flow pathways between right and left cerebral hemispheres

Question 31

what are the main constituents of the circle of willis?

Answer 31

three paired arteries
* anterior cerebral arteries
* internal carotid arteries
* posterior cerebral arteries

two connecting vessels
* anterior communicating artery
* posterior communicating artery