has part has part has_part characteristic of has modifier optic nerve atrophy MP:0001331 MPheno.ontology MP:0001059 atrophy of optic nerve acquired diminution of the size of the optic nerve, associated with wasting as from death and reabsorption of cells, diminished cellular proliferation, decreased cellular volume, pressure, ischemia, malnutrition, reduced function or malfunction, or hormonal changes atrophic optic nerve small optic nerve abnormal atrophied cranial nerve II