neuron degeneration abnormal retinal ganglion cell morphology retinal ganglion cell degeneration degeneration or loss of ganglion neurons located in the innermost nuclear layer of the retina of that receive visual information from photoreceptors via various intermediate cells such as bipolar cells, amacrine cells, and horizontal cells; axons from these cells form the optic nerve and connect mainly to the lateral geniculate nucleus (LGN) and to the suprachiasmatic nucleus in the brain MP:0008067 MPheno.ontology