Fig. 5

GABA-like elements in body segments and the pygidium of Pygospio elegans. a, b Innervation of abdominal segments (a) and pygidium (b), ventral view. White arrowheads label commissures of segmental ganglia. c GABA-like neuronal somata of the segmental ganglion. d Lateral longitudinal nerve in thoracic segments, lateral view. e Innervation of the second body segment, dorsal view. f Innervation of last abdominal segments and pygidium, dorsal view. g-i GABA-like bipolar cells in the body wall at the dorsal side of the segment. k-m Innervation of parapodia. Blue arrowheads – parapodial neurons. Abbreviations: dn – dorsal longitudinal nerve, ln – lateral longitudinal nerve, no – nuchal organ, pn – parapodial nerve, py – pygidium, sbc – segmental bipolar cells, vnc – ventral nerve cord. GABA-like elements – green, acetylated α-tubulin-like elements – magenta, cell nuclei – cyan