The basilar arteries are major blood vessels located at the base of the brain. They are formed by the union of the two vertebral arteries, which run along the spine. These arteries supply blood to important areas of the brain, including the brainstem and the cerebellum, which are crucial for functions such as breathing, heart rate, and coordination. The basilar arteries also give rise to several branches that further supply blood to various parts of the brain. They play a vital role in the cerebrovascular system, ensuring that the brain receives the oxygen and nutrients it needs to function properly.