3. Blood Supply/Interpeduncular
Fossa
Arterial junctions of the
Circle of Willis are the most common sites of aneurysms
1.
Anterior
Cerebral Artery
-
most of the medial
aspect of the brain
-
dorsal ridge
including “leg” areas of pre- and post- central gyri
-
parts of the basal
ganglia and internal capsule
-
pierce anterior
perforated substance à lentiform and caudate nuclei
2.
Middle Cerebral
Artery
-
lateral surface of
the hemisphere except dorsal ridge and occipital pole
-
basal ganglia
(corpus striatum) and internal capsule
-
Broca and Wernicke’s area (in
dominant hemisphere)
-
lenticulo-striate
branches are most important blood
supply to the internal
capsule
o
thin-walled,
therefore hemorrhagic strokes are more common
3.
Posterior
Cerebral Artery
-
lateral and medial
surface of occipital lobe
-
some medial parts
of the temporal lobe
-
parts of the
thalamus, midbrain, choroid plexus
3b. Blood Supply
Corpus striatum and Internal
Capsule |
MCA (medial and lateral striate
branches: lenticulo-striate branches) |
Hippocampus |
PCA |
Thalamus |
PCA posterior communicating a. basilar |
Midbrain |
PCA superior cerebellar a. basilar a. |
Pons |
basilar a. (pontine
branches) |
Medulla |
vertebral a. posterior inferior
cerebellar a. (PICA) |
Cerebellum |
branches of the basilar
artery superior cerebellar artery anterior inferior cerebellar artery branch of the vertebral
artery posterior inferior cerebellar artery |
outer retina and fovea |
choroidal arteries |
remaining neural retina |
central retinal artery (branch
of the ophthalmic artery ß |
macular portion of Area 17 |
PCA + MCA (therefore, macular
sparing possible with PCA lesion) |
auditory cortex |
MCA |
cochlea |
basilar a. à anterior
inferior cerebellar a. à labyrinthine
a. à cochlear a. |