has part has part has_part characteristic of part of has modifier abnormal spinal cord morphology abnormal spinal cord motor column morphology MPheno.ontology any structural anomaly of the subclasses of motor neurons which are organized into longitudinally oriented columns that occupy distinct and, in some cases, discontinuous domains along the rostrocaudal axis of the spinal cord; motor neurons within a single column send their axons to a common peripheral target MP:0009685 morphology abnormal spinal cord motor column