A ferocious spider lives in the brain. His name is Willis! Note (Fig. 10) that he has a nose, angry eyebrows, two suckers, eyes that look outward, a crew cut, antennae, a fuzzy beard, 8 legs, a belly that, according to your point of view, is either thin (basilar artery) or fat (the pons, which lies from one end of the basilar artery to the other), two feelers on his rear legs, and male genitalia.
From Clinical Neuroanatomy made ridiculously simple, by Stephen Goldberg, M.D.