The basilar artery is a relatively large single blood vessel that is found in the posterior cranial fossa. It is formed at the level of the pontomedullary junction by the confluence of both vertebral arteries. The basilar artery further ascends along the midline of the ventral surface of the pons, going within a shallow groove called the basilar sulcus. It travels within the pontine cistern between both abducens nerves (CN VI).