Input to this nucleus comes from the spinal cord, reticular formation , basal ganglia , red nucleus , and tectum . Other axons in the inferior peduncle come from the reticular formation and trigeminal nuclei. Pontocerebellar axons terminate as mossy fiber endings. Think about the functional differentiation of each region as deduced from its connections, particularly its afferents. The cerebellum receives sensory information of all modalities, not just proprioception.
Indirect pathways bring auditory, visual, somatosensory, and cortical information to the cerebellum.
Edward Allen Neilson, W. Curtis Wise, Henry F. Martin. Department of Physiology, The Medical University of South Carolina. Charlston, South Carolina. The deep nuclei are the source of cerebellar efferent fibers. It lies deep in the white matter.