Flashcards in Lecture 10 - Cerebral Hemispheres and Vascular Supply Deck (11):
What is the internal carotid artery?
- gives anterior circulation
- carotid bifurcation - splits to give rise to external and internal carotid arteries
- MCA is a branch of the internal carotid
What are the vertebral arteries?
- gives posterior circulation
- Vertebral arteries form the basilar artery, from the back of the brain, which branches, together with the internal carotid, to give rise to the circle of willis
- Basilar artery bifurcates to give rise to posterior arteries.
What are the branches of the MCA
The MCA bifurcates in the sylvian fissure giving rise to:
- superior - infarction - motor and speech problems, due to affecting the motor cortex and broca’s area.
mostly affecting the feet/foot, because the foot is located at the top
- insular and opercular
What supplies the primary motor cortex?
Anterior cerebral artery
What supplies the primary visual cortex?
What are lenticulostriate arteries?
These are penetrating vessels at the base of the brain.
- Arise from initial portions of MCA before it gets to the sylvian fissure
- supplies basal ganglia and internal capsule
- prone to stroke in hypertension - can cause hemiparesis due to crossing internal capsule - and brocas
What is the recurrent artery of heubner
comes off the initial portion of ACA to supply portions of internal capsule, head of caudate, anterior putamen and globus palladus.
What is the anterior choroidal artery?
arises from the internal carotid artery and supplies globus palladus, putamen, thalamus and posterior limb of internal capsule.
---> infarcts cause hemiparesis
What supplies the hippocampus?
What are watershed infarcts
hypotension can cause less blood surging up into the brain, causing lesions in the peripheries, called watershed zones.
can also happen when blood supply to two adjacent cerebral arteries is compromised, leaving the regions BETWEEN the two vessels to be most vulnerable.
bilateral watershed infarcts can happen with severe drops in blood pressure