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. 2017 Dec 7;11:662. doi: 10.3389/fnins.2017.00662

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Copyright © 2017 Beltz and Benton.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The serotonergic dorsal giant neuron (DGN) innervates each and every glomerulus in the olfactory and accessory lobes. (A) Stacked confocal image of a neurobiotin-filled DGN in a lobster (Homarus americanus) embryo, revealing the massive projections of the DGN within the olfactory and accessory lobes. (B) Photomicrograph of a thick section (100 μm) of the right side of the adult brain of the Australian crayfish Cherax destructor immunolabeled for serotonin. The DGN is the only serotonergic neuron that projects to the AL, but shares its projection into the OL with at least two other serotonergic midbrain neurons. The large cell body of the DGN is dorsal and out of the section plane, but the thin primary neurite that connects it with the olfactory globular tract neuropil (OGTN) before it projects into the OL and AL is observed (arrow). 10, Cluster 10 cell bodies; LAN, lateral antennular neuropil. (C) Neurobiotin injection of the DGN in an adult C. destructor brain illustrating the projections of this neuron to virtually all glomeruli in the OL and AL. Scale bars: (A), 50 μm; (B,C), 100 μm. Adapted from Beltz and Sandeman (2003).