The 3013 neurons in the brain of a fly larva have been mapped in full
https://www.newscientist.com/article/2349650-the-3013-neurons-in-the-brain-of-a-fly-larva-have-been-mapped-in-full/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home