noun a section ofthe hindbrain located at the back of the head beneath the back part of the cerebrum. See il-lustration at BRAIN in SupplementCOMMENT: The cerebellum is formed of twohemispheres with the vermis in the centre. Fi- bres go into or out of the cerebellum through the peduncles. The cerebellum is the part of the brain where voluntary movements are co- ordinated and is associated with the sense of balance