vascular supply

Question 1

brain is a high-demand consumer

Answer 1

• receives 20-25% of blood circulating in body
• uses 25% of oxygen produced
• completely dependent on blood supply as there are no reserves

Question 2

STUDY BLOOD VASCULAR SUPPLY

Answer 2

IN NOTES

Question 3

2 anterior cerebral arteries

Answer 3

supplied by the internal carotids

• mostly anterior FL and corpus callosum
• swoops posteriorly toward parieto-temproal-occipital area

Question 4

2 middle cerebral arteries

Answer 4

• supplied by the internal carotids

- fan-shaped distribution to most lateral brain surface, temporal, parietal, posterior FL

Question 5

2 posterior cerebral arteries

Answer 5

• supplied by the basilar (via the vertebrals)

- occipital lobe, lower temporal lobe

Question 6

collateral supply

Answer 6

a system of blood supply to the brain in case of blockage

-overlap between the cerebral arteries as distribution spreads out, to small vessels at the periphery

Question 7

BBB

Answer 7

• selective permeability of capillaries, arteries (astrocytes help form barrier)
• restricts toxic substances from leaving bloodstream and entering brain tissue or extracellular fluid
• allows “good stuff” in and some “bad stuff” out