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Fig. 6 | BMC Zoology

Fig. 6

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

Fig. 6

Regeneration of the HA-like elements of Pygospio elegans nervous system. a Growing head, 3 dpa (lateral view). b Growing “tail”, 4 dpa (ventral view). c Growing head and thoracic segments, 7 dpa (ventral view). Yellow arrowhead label the first HA-positive neurons, yellow arrows – newly grown thoracic segments. d Growing head, 4 dpa (lateral view). e Growing head, 7 dpa (lateral view). Yellow arrowheads – the first HA-positive neurons. f Growing “tail”, 7 dpa (ventral view). Yellow arrows – newly grown segments. Yellow dashed line marks the cut line. Abbreviations: iln – intestinal longitudinal nerve, pln – palp nerve, vnc – ventral nerve cord. HA-like elements – cyan to white, acetylated α-tubulin-like elements – magenta

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