Blood supply of CNS Flashcards
what is a vascular territory
region of tissue supplied by a given artery
what are 2 main pairs of vessels and what do they supply?
- internal carotid (ICA) - ant/sup portion of cerebrum and ant diencephalon
- vertebral (VA) - brainstem, cerebellum, post cerebrum and diencephalon
where does the ICA traverse
carotid canals from lateral to medial
where does ICA enter cranial cavity
foramen lacerum
what does ICA bifurcate into
- ant. CA
2. middle CA
where do the VAs enter and what do they become
through foramen magnum and become basilar artery
what determines where blood will flow in an anastamoses
to wherever the least resistance is (widest)
what is circle of willis made up of
Acom ACA ICA Pcomm PCA
what surface and pole does ACA supply?
surface: medial
pole: frontal
what surface and pole does MCA supply?
surface: sup-lateral
pole: temp
what surface and pole does ACA supply?
surface: inf
pole: occipital
what is an angiogram
bolus of radio substance into an artery
what does the ICA fill
ACA and MCA
what does VA fill
PCA, basilar
what are watershed areas
border zones supplied by 2 arts
what happens when lose perfusion
30% normal - electical activity fails
10% - ischemia
what supplies ant cord
ASA from the VA
what supplies post. cord
PSA from the VA or PICA
what are 3 hematomas and what causes
- extradural - torn meningeal art from trauma
- subdural - torn cerebral vein
- subarachnoid - ruptured cerebral art
what is embolism
Art occlusion by material in blood (clot, tumor, bacteria)
what is cerebral embolism
in skull
what is a thrombus
emblism caused by a clot
what is an aneurism
dilation of a blood vessel
where are aneurisms most common
vessel branch point
what is arteriovenous malformation
direct A-V connection with no intervening cap. beds
