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Fig. 5 | Frontiers in Zoology

Fig. 5

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

Fig. 5

Development of 5-HT-like (green) and acetylated tubulin-like (red) immunoreactivity in P. dumerilii. 3-segmented larva (a-d), and juvenile worm (e-j). a:7 dpf, showing 5-HT-lir neurons in the cerebral ganglion (asterisk) and ventral cord (arrows). b: 7 dpf, dorsal part of the cerebral ganglion showing the neuropil (asterisk) and dorsolateral neurons (arrows). c: 7 dpf, dorsal part of the head showing apical neurons sa1-sa4 (arrows). d: 7 dpf, 5-HT-lir neurites in the ventral cord group into six longitudinal bundles (arrows). e: 5-segmented juvenile,19 dpf, ventral view on the head region showing the brain (asterisk) and forming subesophageal ganglion (arrows). f: 7-segmented juvenile, 20 dpf, ventral view on the parapodium showing the parapodial ganglion (arrow). g: 7-segmented juvenile, 20 dpf, ventral nerve cord with a medial unpaired bundle of 5-HT-lir neurites (arrows). h: 10-segmented juvenile, 25 dpf, ventral view on the head region showing 5-HT-lir structures in the brain (asterisk), subesophageal ganglion (arrows), ventral cord (vc), tentacular nerves (open arrows), and parapodial nerves (arrowheads). i: 10-segmented juvenile, 25 dpf, lateral view on the head region showing 5-HT-lir structures in the brain (asterisk), subesophageal ganglion (arrow), and pharynx (ph). See additional movie [Additional file 3] for 3D rotatable reconstruction. j: 10-segmented juvenile, 25 dpf, ventral view on the caudal body end showing 5-HT-lir structures in the ventral cord (vc) and anal cirri (arrows); tc – terminal commissure. Scale bars = 20 μm

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