No isolated lesions in humans. Contribute to spasticity and decerebrate rigidity. Ventral and Dorsal Spinocerebellar Tracts Ventral a bundle of fibers originating in the base of the posterior horn and zona intermedia throughout lumbosacral segments of the spinal cord, crossing to the opposite side and ascending in a peripheral position in the ventral half of the lateral funiculus. In its ascent through the rhombencephalon, the tract curves sharply dorsalward along the rostral border of the trigeminal motor nucleus, entering the cerebellum in a caudal direction over the dorsal surface of the superior cerebellar peduncle, and terminating as mossy fibers in the granular layer of the cortex of the cerebellar vermis. The bundle conveys proprioceptive and exteroceptive information largely from the opposite lower extremity.
Terminals end as mossy fibers in the granular layer of the cortex of the cerebellar vermis.
The bundle conveys largely proprioceptive information originating from the annulospiral nerve endings surrounding muscle spindles and from Golgi tendon organs. In Friedreich s ataxia, both dorsal and ventral fibers degenerate, along with the corticospinal tracts and dorsal columns. Resulting in axial and appendicular ataxia.