Given the task definition and input, reply with output. In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

Part of this structure is absent in a syndrome that can cause mega cisterna magna, and which is named for Dandy and Walker. This structure contains the fastigial, globose, emboliform, and dentate nuclei, which are collectively called its namesake "deep nuclei" and are located in the arbor vitae. Marr and Albus proposed theories of this structure's function. This structure includes a narrow medial tissue called its namesake vermis. Inputs in this structure diverge to stimulate a huge number of namesake granule cells, then converge to stimulate a much smaller number of Purkinje cells, which are among the largest neurons. For 10 points, name this portion of the brain involved in balance and motor skills, which is located under the cerebrum.
Science