Fig. 1

Distribution of histaminergic cells in the ventral nerve cord of Thermobia domestica. Maximum projections of cLSM stacks (ventral view, anterior to the top). a The prothoracic ganglion (PTG) contained up to three anterolateral (ALC) and two posterolateral cell bodies (PLC). a’ The PLC showed a short anterior projection pattern (black arrows). b Additionally to the ALC, a pair of medial cell bodies (MC) could be identified in the metathoracic ganglion (MTG). b’ The ALC projected in medial direction (black arrow), although the neurites could only be traced for a short distance. c, d Every ganglion except for the PTG possessed a pair of MC. e In the terminal ganglion (TG), three pairs of consistently labeled neurons (black arrows) and two additional faintly labeled somata groups (black double arrowheads) could be identified. Abbreviations: AG1–7: abdominal ganglia 1–7; ALC: anterolateral cell bodies; MC: medial cell bodies; MTG: metathoracic ganglion; PLC: posterolateral cell bodies; PTG: prothoracic ganglion; TG: terminal ganglion. Scale bars: a–e: 50 μm; a’, b’: 10 μm