cerebral blood flow

Question 1

relative %s of body weight, cardiac output, body O2 consumption and liver glucose of brain and significance

Answer 1

2% body weight, 10-20% cardiac output, 20% body O2 consumption, 66% liver glucose; vulnerable if impaired blood supply

Question 2

2 sources of arterial brain blood supply

Answer 2

interna carotid arteries, vertebral arteries (ascending posteriorly within cervical vertebrae)

Question 3

what is the circle of Willis

Answer 3

circulatory anastomosis that supplies blood to brain and surrounding structures

Question 4

what are cerebral arteries

Answer 4

three main pairs of arteries and their branches, which are part of the circle of Willis and perfuse the cerebrum of the brain

Question 5

what are the 3 pairs of cerebral arteries

Answer 5

anterior cerebral artery (ACA) middle cerebral artery (MCA) posterior cerebral artery (PCA)

Question 6

arteries to brain and meninges

Answer 6

at Adam’s apple, common catorid bifurcates to external (soft tissue of face) and internal carotid arteries (up through base of skull and supplies anterior part of circulation); subcalvian arteries split to form vertebral arteries, which emerge through transverse foramen to base of skull through foramen magnum and up to join rest of blood supply

Question 7

main arteries in circle of Willis

Answer 7

internal carotid artery, basilar artery, vertebral artery

Question 8

anastamotic circle of Willis

Answer 8

both vertebral arteries anastamatose to form basilar artery; this bifurcates into posterior cerebral arteries anteriorly; posterior cerebral artery connects to middle cerebral artery (main branch of internal carotid artery) via posterior communicating artery; middle cerebral artery becomes internal carotid artery medially; middle cerebral artery connetcs to anterior commnicating artery via anterior cerebral artery; anterior cerebral arteries connected anteriorly by anterior communicating artery

Question 9

which artery of circle of Willis is unparied

Answer 9

anterior communicating artery