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parallel fiber
Parallel fibers arise from granule cells in the cerebellar cortex. They form excitatory synapses onto the dendrites of Purkinje cells (the output neurons of the cerebellum) and the dendrites of the inhibitory interneurons basket cells and stellate cells of the molecular layer.
Granule cells are very small and very numerous. They are thought to make up as many as half of the neurons in the brain. Granule cells have axons which rise up and then branch out into parallel fibers. These fibers intersect the Purkinje cell dendrites.〔
Image of Parallel fiber〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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