abnormal dorsal interneuron morphology abnormal dorsal interneuron 1 morphology MP:0021092 MPheno.ontology abnormal dI1 morphology any structural anomaly of the dorsal interneurons that migrate to the deep dorsal horn and intermediate gray tissue, recieve proprioceptive input from the periphery, form commissural projections of dorsal and ventral spinaocerebellar tracts, and are characterized by expression of Atoh1, Brn3a, Barhl1, and Lhx9