Granule cells (green) are tiny neurons in cortex and cerebellum that communicate locally (as compared to pyramidal neurons which tend to send projections across the brain and around the body). This image also shows P2 Receptors (red) which are usually found associated with glia but are also found on Bergmann fibers which are very closely associated with the neurons (appearing yellow here due to the fluorescent overlap). The glial cells in this image are Bergmann glia that are often closely associated with granule cells. These Bergmann glia are found in the cerebellum and are heavily involved with development of the cerebellum- as well as in creating and refining synapses. This image is from a neonatal (newborn) rat cerebellum [Image Source].