Blood Supply

Question 1

Which arteries make up the circle of Willis?

Answer 1

Posterior cerebral artery, posterior communicating artery, internal carotid, anterior communicating artery, and anterior cerebral artery

Question 2

What is the border zone?

Answer 2

Distal territories of cerebral arteries that overlap at the periphery’s. This is where it watershed infarct occur. 

Question 3

What makes up the blood brain barrier?

Answer 3

Endothelial cells of brain capillaries, basal lamina, astrocyte end feet forming glia limitons, pericytes

Question 4

What is the function of the blood brain barrier?

Answer 4

Prevent substances from entering the brain

Question 5

What is a herniation syndrome?

Answer 5

Intracranial event, cause an increase in intracranial pressure and forces brain content over edge of dural reflection

Question 6

Subfalcine or cingulate herniation

Answer 6

Chefs midline brain content shift below, falx cerebri

Question 7

TransTentorial descending herniation.

Answer 7

Central herniation —> Diencephalon forces down increasing pressure on Brainstem
Uncal Herniation —> Uncus forced down increasing pressure on brainstem

Question 8

TransTentorial Ascending Herniation

Answer 8

Upward Cerebellar Herniation —> Cerebellum shoved up causing increased pressure on Brainstem

Question 9

Tonsillar Herniation

Answer 9

Increase Pressure on Medulla