Blood Supply of the Brain

Question 1

what percentage of cardiac output is towards cns

Answer 1

15%

Question 2

blood supply to the brain is divde into

Answer 2

carotid system (anterior system)
vertebral basilar system (posterior system)

Question 3

two major sources of blood for brain is

Answer 3

internal carotid artery

second is right and left vertebral arteries from subclavian

Question 4

carotid system starts as

Answer 4

starts from common carotid artery which then divides into external and internal carotid arteries

Question 5

internal carotid artery route

Answer 5

• internal carotid from heart
• ↑ moves upwards enters middle cranial fossa
• through carotid canal it enters and then
  exits out through foramen lacerum
• carotid canal has an opening through cranium fossa but
  does not have an opening into middle cranial fossa so
  the artery goes upwards to the side and then up
• so now its at middle cranial fossa and there is dural
  venous sinus called cavernous sinus and the artery turns
  upwards
• going through internal clinoid process
• continues upwards where it pierces the dura matter entering in the subarachnoid matter and arachnid matter/space

Question 6

branches of internal carotid artery

Answer 6

• ophthalmic artery and central retinal artery (forward)

- posterior communicating artery and anterior choroidal artery (backwards)

Question 7

terminal branches of internal carotid artery

Answer 7

• anterior cerebral artery (R+L)

- middle cerebral artery

Question 8

connect right and left anterior cerebral arteries

Answer 8

anterior communicating artery

Question 9

circle of willis includes

Answer 9

• anterior cerebral arteries (R+L)
• anterior communicating artery
• internal carotid arteries
• middle cerebral artery
• posterior communicating artery
• posterior cerebral arteries

Question 10

most common sight for berry aneurism

Answer 10

anterior communicating artery

• (60% of aneurisms in wills and berry is highest)

Question 11

supplies a large portion of the medial cerebral hemispheric surfaces namely the corpus callosum, frontal, parietal, and cingulate cortex

Answer 11

anterior cerebral arteries

Question 12

unpaired arteries of circle of willis

Answer 12

anterior communicating and basilar artery

Question 13

arises from the internal carotid and continues into the lateral sulcus where it then branches and projects to many parts of the lateral cerebral cortex

Answer 13

middle cerebral artery

Question 14

supply oxygenated blood to the occipital lobe, part of the back of the human brain

Answer 14

posterior cerebral arteries basilar