Posterior thoracic nucleus
It occupies the medial part of the base of the posterior grey column and appears on the transverse section as a well-defined oval area.[2] Axonal projections from neurons in this nucleus give rise to the dorsal spinocerebellar tract which ascends ipsilaterally through the spinal cord and ends as mossy fibers in the ipsilateral cerebellar cortex after passing through the inferior cerebellar peduncle.[3] Axons originating from the posterior thoracic nucleus which ascend contralaterally through the lateral funiculus of the spinal cord are named ventral spinocerebellar tract which cross over again within the white matter of the cerebellum, to ultimately end on its ipsilateral side.It has been observed that in Friedreich's ataxia there is evident degeneration of the posterior thoracic nucleus as well as other proprioceptive spinal tracts.These patients might present with ataxia, dysarthria, muscle weakness or paralysis and skeletal defects.