has part has part has_part characteristic of part of has modifier abnormal retina layer morphology abnormal retina neuronal layer morphology abnormal retinal neuronal layer morphology MP:0006069 MPheno.ontology any structural anomaly of any of the neuronal layers that make up the retina, including the ganglion cell, inner plexiform, inner nuclear, outer plexiform, outer nuclear layers, the inner and outer segments morphology abnormal retinal neural layer