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A Granule cell (ranule cells refer to tiny neurons (a type of cell) that are around 10 micrometres in diameter. Granule cells are found within the granular layer of the cerebellum, layer 3, inner most layer, of cerebellar cortex. Cerebellar granule cells account for nearly half of the neurons in the central nervous system. Granule cells receive excitatory input from mossy fibers originating from pontine nuclei. Cerebellar granule cells send parallel fibers up through the Purkinje layer into the molecular layer where they branch out and spread through Purkinje cell dendritic arbors. These parallel fibers form thousands of excitatory synapses onto the intermediate and distal dendrites of Purkinje cells using glutamate as a neurotransmitter)
b molecular layer
c purkenje fiber
d granular layer
f white layer
g Climbing fibres from
inferior olivary nucleus
h mossy fiber