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Serotonin-immunoreactive neurons in the suboesophageal ganglion of the caterpillar of the hawk moth Manduca sexta

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Summary

Serotonin-immunoreactivity is mapped in wholemounts and slices of the suboesophageal ganglion (SOG) of larval Manduca sexta by means of immunocytochemistry. An extensive meshwork of serotonin-immunoreactive nerve fibres on some peripheral nerves of the SOG has been demonstrated. This meshwork appears to belong to a serotonergic neurohemal system, probably supplied by two pairs of bilateral serotonin-immunoreactive neurons with big cell bodies on the dorsal side near the midline in the mandibular neuromere. Intracellular recording and staining revealed their physiology and morphology. These neurons produce long lasting (50 msec) action potentials, which suggest that they are neurosecretory cells. Two pairs of bilateral serotonin-immunoreactive interneurons similar to those of other insects are stained in the labial and maxillar neuromeres, but not in the mandibular neuromere. Their ventrolaterally located cell bodies project through a ventral commissure into the contralateral hemiganglion and then cross back again through a dorsal commissure. The axons project into the contralateral circumoesophageal connective.

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  1. Zoologisches Institut der Universität, Basel, Switzerland

    Christian Griss

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  1. Christian Griss
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Griss, C. Serotonin-immunoreactive neurons in the suboesophageal ganglion of the caterpillar of the hawk moth Manduca sexta . Cell Tissue Res. 258, 101–109 (1989). https://doi.org/10.1007/BF00223149

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