Medically reviewed by Nicholas R. Metrus, MD The posterior communicating artery (PCOM) is a part of a group of arteries in ...

or posterior cerebral arteries; (B) basal ganglia, originating from ascending lenticulostriate branches of the middle cerebral artery; (C) the thalamus, originating from ascending ...

The basilar artery typically bifurcates into two posterior cerebral arteries (PCA) (Figure 1). The PCAs supply the occipital lobes and portions of the temporal lobes. Proximally, these arteries ...

and the posterior communicating artery) are at higher risk of bleeding than aneurysms found on blood vessels in the front half of the brain (the carotid artery, the middle cerebral artery, and the ...