Fig. 7
From: Within-family plasticity of nervous system architecture in Syllidae (Annelida, Errantia)
Plakosyllis brevipes. Innervation of prostomium and anterior segments. a: Maximum intensity z-projection of α-tubulin-lir, dorsal sections of the brain and tentacular segment. The nuchal organ sends fibres towards the brain, which connect to the posterior neurite bundles of the brain (orange dotted circle). b: Maximum intensity z-projection of serotonin-lir, dorsal sections of the brain. c: Maximum intensity z-projection of α-tubulin-lir, ventral sections of the brain and tentacular segment. The main palp neurite bundle mainly receives bundles from the ventral root of the circumoesophageal connective which are joined by a few fibres from the dorsal root of the circumoesophageal connective (green arrowhead). d: Maximum intensity z-projection serotonin-lir of ventral planes of the brain. Scale bars = 50 μm. Abbreviations: br – brain; dct – dorsal commissure of tentacular segment; dln – dorsal longitudinal neurite bundle; drcc – dorsal root of circumoesophageal connective; la – lateral antenna; lan – neurite bundle innervating lateral antenna; lln – lateral longitudinal neurite bundle; ma – median antenna; man – neurite bundle innervating median antenna; mn – median ventral nerve; mvn – main ventral nerve; nn – nuchal neurite bundle; pa – palp; pk – serotonin-lir perikarya; pn1 – main palp neurite bundle; pn2 – palp neurite bundle from drcc; pon – posterior neurite bundle; ppa – pharyngeal papilla; prn – neurite bundles innervating prostomium; sn 1 + 2 – neurite bundles innervating posterior edge of tentacular segment; stgn 1–5 – stomatogastric neurite bundle; tcn – neurite bundle innervating tentacular cirri; vln – ventral longitudinal neurite bundle; vnc – ventral nerve cord; vrcc – ventral root of circumoesophageal connective