Neuropeptides in propriospinal neurones in the rat

The presence of neuropeptides in propriospinal neurones has been determined in the rat. Few cervical neurones with long projections to the lumbar cord contained neuropeptides. Lumbar dorsal horn neurones with short intrasegmental projections, and ventral horn neurones with both short intra-and longer intersegmental projections commonly contained neuropeptides. From this, and previous studies, we summarise the organisation of the projections of spinal peptidergic neurones.