part of part of overlaps overlaps adjacent to adjacent to contributes to morphology of eye photoreceptor cell Homo sapiens layer of retina outer nuclear layer of retina retinal outer nuclear layer outer nuclear layer BTO:0005600 Wikipedia:Outer_nuclear_layer (...) an essentially similar sequence of events occurs during the embryonic development of the vertebrate eye. The eye initially develops as a single median evagination of the diencephalon that soon bifurcates to form the paired optic vesicles. As each optic vesicle grows towards the body surface, its proximal part narrows as the optic stalk, and its distal part invaginates to form a two-layered optic cup. (...) The outer layer of the optic cup becomes the pigment layer of the retina, whereas the inner layer differentiates into the photoreceptive cells and neuronal layers of the retina.[well established][VHOG] The layer within the retina where the photoreceptor cell bodies reside. stratum nucleare externum retinae UMLS:C0229210 ONL EMAPA:19157 UBERON:0001789 retina outer nuclear layer FMA:58684 stratum nucleare externum (retina) XAO:0003219 retina, outer nuclear layer NCIT:C33236 BAMS:Ronl ZFA:0001464 MA:0001315 layer of outer granules retinal outer nuclear layers SCTID:280678009 TAO:0001464 external nuclear layer neural retina outer nuclear layer VHOG:0001170 outer plexiform layer of retina retinal neural layer