The axons from the pontine nuclei into the cerebellum are referred to as mossy fibers.
One of the main inputs to the cerebellum are mossy fibers. This system receives information from a variety of sources, the largest of which is the cerebral cortex, which communicates with the cerebellum through the pontocerebellar pathway.
The vestibular nerve and nucleus, the spinal cord, the reticular formation, and feedback from the deep cerebellar nuclei are further factors. Fine mossy fiber axon branches wind across the layer of granule cells, and tiny enlargements that give the appearance of knots signify synaptic connections.
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