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. 2017 May 5;11:32. doi: 10.3389/fncir.2017.00032

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Copyright © 2017 Watanabe, Nishino, Mizunami and Yokohari.

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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Two major types of uniglomerular projection neurons (PNs) in the cockroach brain. (A,B) Mass staining of PNs in the antennal lobe (AL). PNs (green) were stained by dye injection into the medial ALT (m-ALT) and olfactory sensory neurons (OSNs) (magenta) were labeled by anterograde staining from the antennal nerves. Axons of PNs form two different bundles in the AL (arrowheads and arrows in A,B), and their cell bodies separately cluster in the dorsal region of the AL. Loci of clusters of cell bodies correspond to the two major types of PNs; type1 and type2 PNs. Depth of serial optical image from anterior surface is indicated in each panel. (C,D) 3D images of two major types of uniglomerular PNs. Axons of both type2 PN (C) and type1 PN (D) run through the m-ALT, anteriorly to the mushroom bodies (MB) peduncle (PED) and terminate in both MB calyces (CA) and lateral horn (LH). (E,F) PN type-specific glomerular organization, viewed anteriorly (E) and medially (F). Glomeruli innervated by intracellularly stained PNs are colored according to PN types. Type2 PNs specifically arborize in the antero-dorsal group glomeruli (magenta in E,F), whereas type1 PNs arborize in the postero-ventral group glomeruli (green in E,F). Glomeruli innervated by ALT2 and ALT3 uniglomerular PNs, which have been identified by Malun et al. (1993), are colored blue. Two macroglomeruli innervated by sex pheromone-sensitive PNs are colored red. Bars in (A,E) = 100 μm, bar in (C) = 200 μm.