Figure 4.

Penilia avirostris, A combined nuclei (cyan) and nervous system (yellow) image shows the innervation of the posterior end of the body, B-D nervous system data illustrating the development of the subesophageal region (ventral view). ac-tub acetylated tubulin, a-Cm anterior commissure, Cn connective, Md mandibular neuromere, Md N mandibular neuromere nerve, Mx1/2 maxillula/maxilla neuromere, Mx1 N maxillula neuromere nerve, Ntb neurite bundle, opt-Np optical neuropil, p-Cm posterior commissure, Pc-lL protocerebral lateral lobes, Syt Sytox, Thoracic neuromere(s), Th N thoracic neuromere nerve(s), Tc-Cm tritocerebral commissure.