abnormal spinal cord morphology abnormal spinal cord grey matter morphology MA:0000002 MP:0008503 MPheno.ontology abnormal spinal cord gray columns morphology abnormal spinal cord gray matter morphology abnormal spinal cord grey columns morphology abnormal spinal cord mantle layer morphology any structural anomaly of the ridge-shaped grey matter of the spinal cord that extends longitudinally through the center of each half of the spinal cord, and are largely or entirely composed of nerve cell bodies and their dendrites and some supportive tissue