Earlier single unit studies show majority of DCN neurons receive a single class of primary fibers. Therefore the response classes can be correlated with primary fibers. RA fibers found to be congruent with clusters. Appear to be separate somatotopic maps for each response class. Modular arrangement for place and modality is first set by primary afferent fibers.
Defects depend on the level of lesion.
At lower gracile levels there is a severe defect in tactile and proprioceptive sensibility. Other severe defects such as loss of guided movement of arms. Therefore DC is involved in accurate and rapid regulation of force of distal movements. SCT projects to VBC through medial lemniscus. STT projects VBC and Posterior nuclear group outside of medial lemniscus.