The Circle of Willis and Cranial Nerves

The Circle of Willis is a ring of arteries at the base of the brain. The Circle of Willis contains five aortic archs, there is the posterior communicating, posterior cerebral,middle cerebal, anterior cerebral, and anterior communicating. It is the brains major blood flow and has two main arteries. The Circle of Willis has a backup artery in case one artery gets clogged and the other one will flow.
There are twelve pairs of Cranial Nerves. The twelve pairs are known as Olfactory, Optic, Oculomotor, Trochlear, Abducens, Trigeminal, Facial, Vestibulocochlear, Glossopharyngeal, Vagus, Spinal, and Hypoglossal. Three of the pairs of nerves are consider sensory: Olfactory, Optic, and Vestibulocochlear. The rest of the nerves are considered mixed. The mixed nerves have a sensory portion and motor portion, these mixed nerves have the sensory and motor part mixed together.