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Fig. 9 | Frontiers in Zoology

Fig. 9

From: Development of the nervous system in Platynereis dumerilii (Nereididae, Annelida)

Fig. 9

Summary diagram of the ontogeny of FMRFamide-like structures in P. dumerilii. The earliest FMRFa-lir somata appear in early trochophores. Basal neurites of the solitary dorsal neuron fd outline the future prototroch nerve. Three apical sensory neurons fa 1–3 send basal fibers into apical neuropil. By the late trochophore stage, the set of larval sensory neurons is supplemented with a solitary posterior sensory cell p1, two lateral cells fl 1–2, and three more apical cells fa 4–6. Besides, the first pair of central neurons fv 1,2 appears in the developing brain. Basal fibers of these cells outline the prototroch nerve, ventral cord and cerebral commissures. At the metatrochophore stage, many more sensory cells and additional central neurons appear in the episphere. Starting from the nectochaete stage, the adult CNS develops rapidly. Apical end is always up. Relative dimensions are not maintained

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