abnormal nervous system tract morphology abnormal anterior corticospinal tract morphology MP:0009682 MPheno.ontology abnormal Turck bundle morphology abnormal Turck column morphology abnormal anterior cerebrospinal fasciculus morphology abnormal anterior pyramidal fasciculus morphology abnormal anterior pyramidal tract morphology abnormal direct pyramidal tract morphology abnormal medial corticospinal tract morphology abnormal ventral corticospinal tract morphology any structural anomaly of the small bundle of corticospinal motor fibers that do not cross the midline at the pyramidal decussation and descend into the anterior funiculus of the spinal cord; the anterior corticospinal tract controls central axial and girdle muscles