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Fig. 3 | BMC Zoology

Fig. 3

From: Histamine and gamma-aminobutyric acid in the nervous system of Pygospio elegans (Annelida: Spionidae): structure and recovery during reparative regeneration

Fig. 3

HA-like elements in body segments and the pygidium of Pygospio elegans. a Innervation of 5th and 6th thoracic segments. White arrowheads label the somata of HA-like peripheral neurons. Yellow arrows indicate HA-like cell clusters of the body wall. b Peripheral HA-like neuron of thoracic segment (white arrowhead). c, d Posterior thoracic segments with HA-like cell clusters in the body wall (yellow arrows). e, f High magnification of HA-like cells in the body wall. g Optical section through the body segments showing the innervation of intestine. Dotted lines outline the intestine. h Innervation of abdominal segments (ventral view). Yellow arrowheads label HA-positive irregularly shaped body wall cells. i Optical section showing the distribution of HA-like cells in the body wall of abdominal segments (yellow arrowheads). j Innervation of the pygidium and posterior segments (ventral view). Abbreviations: ch – chaetae, il – intestinal lumen, iln – intestinal longitudinal nerve, pn – parapodial nerve, py – pygidium, vnc – ventral nerve cord. HA-like elements – cyan to white, acetylated α-tubulin-like elements – magenta, cell nuclei – orange

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