Cannaboloid binding sites are dense in fly brains and in other creatures. neurons=- jelly bean shape, one main nerve fiber, axon, many dendrites, highly structured, not random as they may seem. cones& rods to cells to cells to optic nerve to lateral geniculate bodies in thalmus (peanut size) to primary visual cortex - processing happens in each level - sorting, sending to specialized columns of cells. stererlithography