Posterior external arcuate fibers

The posterior external arcuate fibers (dorsal external arcuate fibers) take origin in the accessory cuneate nucleus ; they pass to the inferior peduncle of the same side.

It carries proprioceptive information form the upper limbs and neck. It is an analogue to the dorsal spinocerebellar tract for the upper limbs. In this context, the "cuneo-" derives from the accessory cuneate nucleus, not the cuneate nucleus. (The two nuclei are related in space, but not in function.)