Circulation of the Brain

Question 1

what supplies posterior brain circulation

Answer 1

vertebral aa. from subclavian aa.

Question 2

what supplies anterior brain circulation

Answer 2

internal carotid aa. from common carotid aa.

Question 3

what does the internal carotid a. enter the skull thru

Answer 3

carotid canal

Question 4

what are the branches of the internal carotid a.

Answer 4

opthalmic a.
anterior cerebral a.
middle cerebral a.

Question 5

what does the anterior cerebral a. supply

Answer 5

medial aspect of cerebral hemisphere thru parietal lobe
- frontal and parietal

Question 6

what does the middle cerebral a. supply

Answer 6

deep structures of brain
lateral aspect of hemisphere
- frontal, temporal, parietal

Question 7

where do the vertebral aa. enter the skull

Answer 7

foramen magnum

Question 8

what is the path of vertebral aa. that results in posterior circulation

Answer 8

enter skull thru foramen magnum
form basilar a. at pons
basilar ends in 2 post communicating aa.

Question 9

what regions of the brain does posterior circulation supply

Answer 9

brainstem
cerebellum
back of cortex

Question 10

what is the significance of the Circle of Willis

Answer 10

ant and post circulations join

Question 11

what is a common characteristic of the Circle of Willis

Answer 11

asymmetrical