Leonardo da Vinci while making wax castings of the human brain back in 1504 was the first to and coin the term “cerebellum” (Latin for “little brain”) after identifying two small brain hemispheres tucked neatly under the relatively humongous left-right hemispheres of the “cerebrum” (Latin for “brain”). This module explores the integrated structure and function of the cerebellum from its classical view in coordinating movement to its more progressive functional role in higher cognitive processing. Common clinical disorders will be discussed emphasizing diagnostic and treatment applications.