An artery formed by the right and left vertebral arteries which supplies blood to parts of the cerebrum and cerebellum. It supplies blood to many brainstem structures and leads to the right and left posterior cerebral arteries.

The artery that originates from the junction of the two (L & R) vertebral arteries (VA) and runs along the dorsal clivus (base of the skull), anterior to the brainstem, before dividing in a terminal bifurcation into the two posterior cerebral arteries (PCA). image BIFURCATION: The point where a structure divides into two branches. image

A posterior artery that forms from the right and left vertebral arteries, which provide circulation to the posterior portion of the brain.