[TA] a cell group lateral to the cuneate nucleus that receives posterior-root fibers corresponding to the proprioceptive innervation of the arm and hand; it projects to the cerebellum by way of the cuneocerebellar tract, and can be considered the upper-extremity equivalent of the thoracic nucleus. SYN: nucleus cuneatus accessorius [TA], external cuneate nucleus, lateral cuneate nucleus, Monakow nucleus.