Fig. 10
From: The development of the adult nervous system in the annelid Owenia fusiformis
Diagram of neural development in O. fusiformis. a At 24 hpf there is an FVamide-lir, RYamide-lir, RGWamide-lir, MIP-lir and FMRFamide-lir apical organ with elav+ and synaptotagmin+ cells that connect to the prototroch ring [24]. b The brain goes from a bilobed structure in the pre-competent larvae, to a nerve ring in the juvenile c Pattern of immunoreactivity and soxC and six3/6 expression in the juvenile. ao: apical organ; as: abdominal segment; at: apical tuft; br: brain; ch: chaetae; cs: chaetal sac; cts: ciliated thoracic segment; dn: dorsal nerve; dnc: dorsal nerve cord; dr: dorsal root; fn: frontarl nerve; gz: growth zone; lc: lateral cord; lmc: lateral medullary cords; lpn: left peripheral nerve; mg: midgut; pgo: parapodial glandular organ; pr: prototroch ring; pt: prototroch; rbl: right brain lobe; rpn: right peripheral nerve; vr: ventral root