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. 2021 Jun 22;11:13045. doi: 10.1038/s41598-021-91025-5

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© This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Quantities (monomorphisms) of directed three-node motifs from the C. elegans chemical synapse connectome and the MICrONS v185 graph. (a) C. elegans directed three-node motif counts. The most commonly encountered directed three-node motif is the “fan-in” motif, where two neurons converge to a single downstream target. All directed three-node motifs occur at least once. (b) MICrONS v185 directed three-node motif counts. The most common motif is the “fan-out” motif, where one neuron synapses onto two downstream targets. Several three-node motifs appear infrequently or do not appear at all. This illustrates differences between the connectivity patterns of a complete connectome such as the worm’s and a mammalian brain region that is expected to be largely feed-forward.