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Using FIB-SEM we report the entire synaptic connectome of glomerulus VA1v of the right antennal lobe in  Drosophila melanogaster . Within the glomerulus we densely reconstructed all neurons, including hitherto elusive local interneurons. The  fruitless -positive, sexually dimorphic VA1v included &gt;11,140 presynaptic sites with ~38,050 postsynaptic dendrites. These connected input olfactory receptor neurons (ORNs, 51 ipsilateral, 56 contralateral), output projection neurons (18 PNs), and local interneurons (56 of &gt;150 previously reported LNs). ORNs are predominantly presynaptic and PNs predominantly postsynaptic; newly reported LN circuits are largely an equal mixture and confer extensive synaptic reciprocity, except the newly reported LN2V with input from ORNs and outputs mostly to monoglomerular PNs, however. PNs were more numerous than previously reported from genetic screens, suggesting that the latter failed to reach saturation. We report a matrix of 192 bodies each having  &gt; 50 connections; these form 88% of the glomerulus’ pre/postsynaptic sites.

A resource for the Drosophila antennal lobe provided by the connectome of glomerulus VA1v