13: Blood Supply In The Brain Flashcards
Vertebral A vs ICA % of blood to brain
Vertebrals: 20%
ICAs: 80%
What does the ICA bifurcate into?
ACA + MCA
Where are all the major vessels of the brain found?
Subarachnoid space
What is the space called surrounding the major vessels of the brain
Perivascular space (Virchow-Robin space)
Four arteries in the circle of Willis
ACA, PCA, ACoA, PCoA
Completeness of circle of Willis
Complete and symmetric in only 20% of people
Hypoplasticity of circle of Willis
PCoA, ACoA, and right vertebral A may be hypoplastic -> unaffected portion can hyperperfuse the affected circulation, can cause ischemia or cerebral edema
Watershed region of cerebrum
Border-zone regions supplied by major cerebral A’s
ACA location
Next to CN 1 and 2
Damage to Wernicke’s region
Pts talkative, but lack content or meaning in spoken and written language
Basilar A flow direction
Blood can flow anterior posterior depending on pressure differences
Terminal branches of the basilar A
PCA’s
Location of SCA
Just posterior to CN 3
Location of AICA
In the pontobulbar sulcus near CN 6, 7, and 8
Superficial middle cerebral V location
Lateral fissure
