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Fig. 14 | Frontiers in Zoology

Fig. 14

From: Within-family plasticity of nervous system architecture in Syllidae (Annelida, Errantia)

Fig. 14

Overview of the anterior nervous system and associated lobes of the Syllinae. All species possess a pair of nuchal lobes which are restricted to the achaetous segment and consist of support cells of the nuchal organ. Dorsolateral clusters of somata were only found in the Syllis species. The palps are innervated by at least a main neurite bundle and a neurite bundle from the dorsal root of the circumoesophageal connective. A third neurite bundle reaches from the ventral root of the circumoesophageal connective inside the palps, which is missing in Plakosyllis brevipes. A distinct circumoesophageal ganglion is not present. Somata are clustered on the ventral side of the circumoesophageal connective, fusing with the ganglion of the first chaetiger. Abbreviations: drcc – dorsal circumoesophageal connective; vrcc – ventral circumoesophageal connective

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