For 10 points, name this structure found below the cerebrum whose name means "little brain."
This structure has three main divisions, including the flocculonodular lobe, and it is composed mostly of minute granule cells. One portion of this structure is called the arbor vitae and contains "deep nuclei" that receive excitatory input from mossy fibers and inhibitory input from Purkinje fibers. Three peduncles connect it to other portions of the (*) brain. Its hemispheres are divided by the vermis, and this structure is responsible for maintaining balance and coordinating and regulating muscle activity. For 10 points, name this structure found below the cerebrum whose name means "little brain."
This structure has three main divisions, including the flocculonodular lobe, and it is composed mostly of minute granule cells.
{cerebellum}