How does the cerebellum process movement and somatosensory information?
There are three major cellular layers of the cerebellar cortex: the molecular, Purkinje, and granule cell layers.
Corticopontine fibers synapse in the pons, cross, and project to the contralateral cerebellar cortex via the MCP (mossy fibers).
Information from the inferior olives (climbing fibers) and spinocerebellar tract (also mossy fibers) are received via the ICP.
Climbing fibers reach the Purkinje layer directly while mossy fibers synapse on granule cells, which then send long parallel fibers that in turn synapse on Purkinje cells.
Purkinje cells organize the main output of the cerebellar cortex by sending axons to the deep cerebellar nuclei.
The fastigial nuclei connect to the reticular formation, the interposed nuclei to the red nucleus, and the dentate nucleus to the thalamus.