Figure 4.

Drosophila central nervous system (CNS) development. (A) A schematic of the embryonic, larval, and adult Drosophila CNS. The central brain (CB), ventral nerve cord (VNC), and optic lobes (OL) are labeled. The embryonic midline is indicated in purple, and the mushroom body neuroblasts, as well as the fully formed mushroom bodies in the adult, are depicted in magenta (not to scale). (B) A schematic depicting the sagittal view of the developing CNS. Shown are four embryonic followed by larval, pupal and adult stages. In Stage 8 of embryogenesis, prior to delamination, the neurogenic regions which give rise to the brain and VNC are shown in light green. In subsequent stages, the nervous system is shown in white.