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The two main tracts are the dorsal spinocerebellar tract, and the ventral spinocerebellar tract. Both of these tracts are located in the peripheral region of the lateral funiculi (white matter columns). [1] Other tracts are the rostral spinocerebellar tract, and the cuneocerebellar tract (posterior external arcuate fibers). [2]
Cuneocerebellar tract: unconscious proprioceptive information from the upper limb and neck. This tract originates at the ipsilateral accessory cuneate nucleus and travels through the inferior cerebellar peduncle to reach the spinocerebellum part of the cerebellum. Trigeminocerebellar tract: unconscious proprioceptive information from the face.
It relays unconscious proprioceptive sensory information from the upper limb and upper trunk to the cerebellum via the cuneocerebellar fibers. [ 2 ] The neurons of the ACN (as well as those of the lateral portion of the cuneate nucleus) are functionally homologous with the posterior thoracic nucleus ; the cuneocerebellar fibers are therefore ...
The spino-olivary tract is a non-specific indirect ascending pathway and is connected to the inferior olivary nuclei. The axons enter the spinal cord from the dorsal root ganglia and terminate on unknown second-order neurons in the posterior grey column . [ 2 ]
The fibers of the anterior spinocerebellar tract originate in Clarke's column of the spinal cord and cross in the anterior white commissure to the lateral funiculus, where they ascend to upper pontine levels before crossing back to enter the cerebellum through the superior peduncle. They terminate in the hind limb region of the cerebellar cortex.
The middle cerebellar peduncle is the largest of the three cerebellar peduncles. It connects the pons and cerebellum.It consists almost entirely of fibers passing from the pons to the cerebellum (fibrocerebellar fibers); the fibers arise from the pontine nuclei and decussate within the pons before entering the peduncle [1] to end in the contralateral cerebellar hemisphere.
Cerebellovestibular fibers: [1]: 290-291 arise from Purkinje cells of the flocculonodular lobe of the cerebellum. [1]: 297 Fastigiovestibular fibers: mainly project to both ipsilateral and contralateral lateral and inferior vestibular nuclei to influence both vestibulospinal tracts.
If you study closely this image from the article, you will see that in both limbs (lower arms, upper/lower legs) muscle fibers seem to combine with golgi tendons to enter the dorsal spinocerebellar tract, whereas the upper arms (also with combined spindle/golgi fibers) enter the [spino]cuneocerebellar tract. This seems to contradict 2 pieces of ...