BLOOD SUPPLY CORTEX - MODULE Flashcards
The brainstem is supplied with blood by a network of arteries collectively called the…
vertebral-basilar system
The vertebral-basilar system arises from ____ which branch off from the _____
vertebral arteries
subclavian arteries
The cortex and deep structures are supplied with blood from the anterior arterial system which arises from the
internal carotid arteries
The anterior system anastomoses with the posterior vertebral-basilar system at the ____
circle of willis
The circle of willis creates
collateral flow
only ___% of individuals desplay a complete circle of willis
34%
The basilar artery bifurcates to form the
posterior cerebral artery
The internal carotide arteries supply the ____ and _____ arteries
middle cerebral and anterior cerebral arteries
The posterior cerebral arteries curve around the ____ on their way to the cortex
midbrain
The posterior cerebral arteries supplies the…
- Medial surface of the occipital and temporal lobes
- Inferior and medial parts of the temporal lobe
- Portions of the lateral temporal and occipital lobes
- Thalamus
The middle cerebral artery is the direct branch from the ______
internal carotid artery
The MCA curves to enter the ____, where it then divides into multiple end branches
lateral fissure
Where do the divisions of the MCA travel
they form loops as they travel over the insula and thene xit the lateral fissure and pass onto the lateral surface of the cortex
What does the superior division of the MCA supply
portions of the frontal and parietal cortex located above the fissure
What does the inferior division of the MCA supply
the temporal and parietal cortex located below the fissure
What are lenticulostriate arteries
Deep branches of the MCA, as well as some additional branches of the ACA
What do lenticulostriate arteries supply
regions of the basal ganglia and internal capsule
The two anterior cerebral arteries anastomose anteriorly at the _____
anterior communicating artery
What does the anterior cerebral artery supply
- most of the cortex on the medial surface of the frontal and parietal lobes and the
- cortex on the inferior surface of the frontal lobe
- 1-2 cm of the cortex on the lateral surface of the frontal and parietal lobes
What do the end branches of the ACA supply
1-2 cm of the cortex on the lateral surface of the frontal and parietal lobes
The ACA passes anteriorly to enter the longitudinal fissure and then swings posterior to travel along…
the superior surface of the corpus callosum
The ACA generally bifurcates into two main branches on the ____ surface of the brain
medial
What are the anterior choroidal arteries branches of
the internal carotid artery
The anterior choroidal arteries travel to the ______ in which part of the brain?
Choroid plexus in the lateral ventricle
What is the perfusion territory of the anterior choroidal arteries
- Globus pallidus
- Putamen
- Tail of the caudate nucleus
- Posterior limb of the internal capsule
- Hippocampus
- Inferior horn of lateral ventricle
Why is the anterior choroidal artery vulnerable to increases in blood pressure? what is the effect of this?
It is small in diameter, but branches off of the high-pressure internal carotid artery. This can lead to bursting of the small arterial walls, and hemorrhagic stroke
What is a watershed area
the area where two perfusion territories come together
When are watershed areas vulnerable
- severe drops in systemic blood pressure
- Partial occlusion of a major blood vessel
The basal ganglia receives blood supply from which vessels
- ACA
- MCA
- PCA
- Anterior choroidal
