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Figure 2 | BMC Evolutionary Biology

Figure 2

From: Serotonin-immunoreactive neurons in the ventral nerve cord of Remipedia (Crustacea): support for a sister group relationship of Remipedia and Hexapoda?

Figure 2

General morphology of the ventral nervous system of Speleonectes tulumensis . (A-C) Dorsal view on confocal laser-scans of horizontal vibratome sections (50 μm) through the trunk of Speleonectes tulumensis labeled for acetylated α-tubulin-immunoreactivity (TUB-IR, yellow) and nuclear marker (NUC, blue). (A) Each trunk ganglion (TG) comprises an anterior and a posterior commissure (AC and PC) connecting both hemiganglia. Two segmental nerves (ASN and PSN) leave each hemiganglion laterally and project into the appendages. The posterior segmental nerve (PSN) splits into three branches (numbers 1–3). Furthermore, an intersegmental nerve (ISN) innervates the periphery and sends neurite bundles anteriorly and posteriorly (arrows) parallel to the connectives (CONs). These longitudinal CONs and a slender longitudinal median neurite bundle (MNB) connect the segmental ganglia of proximate segments. (B) Between the segmental ganglia, two branches leave the MNB posterolaterally (arrow) and split immediately into two branches (arrowhead), one of which projects anterolaterally. (C) One branch of the ISN grows posteriorly and ventrally (arrow) and splits in numerous radially distributed neurites. Abbreviations: numbers 1–3: neurite bundles originating from the posterior segmental nerve; AC: anterior commissure; ASN: anterior segmental nerve; CON: connective; ISN: intersegmental nerve; MNB; unpaired longitudinal median neurite bundle; NUC: nuclear marker; PSN: posterior segmental nerve; TG: trunk ganglion; TUB-IR: acetylated α-tubulin-immunoreactivity.

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