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 ICA)

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.