Diagram showing the layout of the base of a human brain. This illustration appeared in De nervis opticis nonnullisque aliis praeter communen opinionem in humano capite observatis" by Constanzo Varolio, published at Padua in 1573. Of interest are the eyes and optic nerves, the cerebellum (cross-hatched area at bottom) and the medulla oblongata (vertical line shading just below centre)."