The vertebrobasilar artery is an important blood-supplying artery to the cranium and brain, including the vertebral and basilar arteries. The vertebrobasilar artery can provide a certain amount of blood to the cranium and brain, and is an important blood supply artery. The vertebral basilar artery can be divided into two parts: the vertebral artery and the basilar artery. The vertebral artery can be divided into left and right branches, and the left and right vertebral arteries can enter the cranium through the transverse processes of the cervical vertebrae, and the two vertebral arteries merge into a basilar artery in the cranium. The vertebral arteries and basilar arteries can send out small blood vessels of different sizes and thicknesses to provide blood supply to different parts of the cranial brain, such as the inner ear, thalamus, brainstem, cerebellum, and occipital lobe. The vertebral and basilar arteries and their branches are clinically known as the vertebrobasilar system.