Unconscious position sense information from most of the body travels along axons from the periphery to enter the spinal cord. This information then ascends the spinal cord in multiple pathways called the spinocerebellar tracts, most of which ascend ipsilaterally, sometimes directly from peripheral neurons and sometimes after synapsing on interneurons in the spinal gray matter. The spinocerebellar tracts project to the ipsilateral cerebellum, mostly through a structure called the inferior cerebellar peduncle, which connects the inferior brainstem to the cerebellum.
The cerebellum uses this information to coordinate movements of the limbs and torso, so that lesions of these tracts may cause incoordination. Similar information from parts of the head and neck travels in several cranial nerves and different pathways through the brainstem to the cerebellum to coordinate movements of these areas.
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Introduction to Neurology 