Fig. 11
From: Within-family plasticity of nervous system architecture in Syllidae (Annelida, Errantia)
Syllis garciai. Innervation of prostomium and anterior segments. a: Maximum intensity z-projection of combined α-tubulin-lir (grey) and cell nuclei (magenta). Dorsal planes of the prostomium with inset of laterofrontal sense organ (α-tubulin-lir only). Several bundles (red arrows) separate from the main palp neurite bundle and form a plexus inside the palps. A neurite bundle (asterisk) reaches posteriorly at the transition of the main palp neurite bundle and the brain, into a cluster of dorsolateral somata. b: Maximum intensity z-projection of combined α-tubulin-lir and cell nuclei, ventral planes. Innervation of palps. c: Maximum intensity z-projection of serotonin-lir, dorsal planes of prostomium. The brain shows a strong serotonin-lir signal but separate commissures are hard to differenciate. d: Maximum intensity z-projection of combined serotonin-lir, ventral planes. All of the three neurite bundles innervating the palps are visible. e: Maximum intensity z-projection of α-tubulin-lir and cell nuclei. Detail of nuchal organ, dorsal. Fibres from primary sensory cells of the nuchal organ reach towards the posterior neurite bundles of the brain. The nuchal lobes (green line) lie behind the cilia of the nuchal organ. f: Colour coded z-projection of serotonin-lir, median planes. Palp nerves and serotonin-lir perykarya are visible. g: Colour coded z-projecion of α-tubulin-lir, ventral planes with inset of maximum intensity z-projection of α-tubulin-lir of stomatogastric neurite bundle number 5. Two stomatogastric neurite bundles leave the ventral part of the neuropil. Another two pairs emerge from the vrcc, fusing shortly after emergence, followed by a fifth small neurite bundle (in inset). Scale bars = 50 μm, insets = 25 μm. Abbreviations: acvr – anterior dorsal commissure of vrcc; cu – cuticle; dcs – dorsolateral cluster of somata; dcvr - dorsal commissure of vrcc; drcc – dorsal root of circumoesophageal connective; lan – neurite bundle innervating lateral antenna; lfs – laterofrontal sense organ; lln – lateral longitudinal neurite bundle; ndln – fibres from nuchal organ joining dorsal longitudinal neurite bundle; nn – nuchal neurite bundle; pk – serotonin-lir perikarya; pn1 – main palp neurite bundle; pn2 – palp neurite bundle from drcc; pn3 – palp neurite bundle from vrcc; pon – posterior neurite bundle; smf – spherical median front of the brain; stgn1–5 – stomatogastric neurite bundles 1–5; tcn – neurite bundle innervating tentacular cirrus; vrcc – ventral root of circumoesophageal connective