Figure 3.

Model summarizing a view of events leading to the production of new olfactory interneurons in adult crayfish (from Sullivan et al., 2007b). Neuronal precursor (1^st generation) cells reside within a neurogenic niche where they undergo mitosis. Their daughters (2^nd generation precursors) migrate along tracts created by the fibers of the niche cells, towards either the LPZ or the MPZ. At least one more division will occur in the LPZ and MPZ before the progeny (3^rd and subsequent generations) differentiate into neurons. (Image from Zhang et al., 2011).