The formation of continuously ordered mappings.
D000818:Animals; D001921:Brain / Q000196:embryology; D006224:Cricetinae; D003621:Daphnia; D006054:Goldfish; D007865:Leeches; D008959:Models, Neurological; D009416:Nerve Regeneration; D009434:Neural Pathways / Q000502:physiology*; D049831:Octopodiformes; D009900:Optic Nerve / Q000502:physiology; D011896:Rana temporaria; D013569:Synapses / Q000502:physiology; D014981:Xenopus