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Biological: Behavioural genetics · Evolutionary psychology · Neuroanatomy · Neurochemistry · Neuroendocrinology · Neuroscience · Psychoneuroimmunology · Physiological Psychology · Psychopharmacology (Index, Outline)
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 90% of the neurons in the brain.