Cerebellum structure. Coloured light micrograph of a section through the highly-folded cerebellum of the brain. The cerebellum comprises three main layers. The outer grey matter (cortex) comprises the molecular layer (red) and the granular layer (green). The molecular layer is largely made up of the highly branched dendrites of Purkinje nerve cells, the large round bodies of which are found at the junction between the molecular and granular layers. Within the grey matter is the white matter (dark green), largely made up of the axons of the grey matter's nerve cells. The cerebellum is involved in motor control, sensory perception and learning. Magnification: x8 when printed 10cm wide.