Parallel fiber 

Parallel fiber
Microcircuitry of the cerebellum. Excitatory synapses are denoted by (+) and inhibitory synapses by (-).
MF: Mossy fiber.
DCN: Deep cerebellar nuclei.
IO: Inferior olive.
CF: Climbing fiber.
GC: Granule cell.
PF: Parallel fiber.
PC: Purkinje cell.
GgC: Golgi cell.
SC: Stellate cell.
BC: Basket cell.

Parallel fibers arise from granule cells in the cerebellar cortex. They form synapses onto the dendrites of Purkinje cells (the output neurons of the cerebellum).

Granule cells are very small and very numerous. They are thought to make up as many as half of the neurons in the brain.

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Brain: Metencephalon/rhombencephalon - cerebellum (hindbrain)
Regions
Layers
Molecular layer (Stellate cell, Basket cell)

Purkinje cell layer (Purkinje cell, Bergmann glia cell = Golgi epithelial cell)

Granule cell layer (Golgi cell, Granule cell, Unipolar brush cell)

Fibers: Mossy fibers • Climbing fiber • Parallel fiber
Deep cerebellar nuclei
Peduncles