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. 2023 Jul 6;12:e84257. doi: 10.7554/eLife.84257

Figure 8. CAM-input-neurons (CINs) exclusively innervate complex AMs (CAMs) via large multisynaptic boutons.

Figure 8.

(A) Reconstruction of the CINs (pink) superimposed on the CAMs that are their main postsynaptic partners (blue hues). (B, C) 3D arrangement of a large CIN presynaptic bouton innervating multiple CAM dendrites (3 in B; 4 in C). CAM twig endings varied in shape resembling flattened dendritic spine enlargements. As indicated in (C), their structure can be divided into at least 5 classes. Right inset, three consecutives near cross-sections through a CIN bouton and its three postsynaptic targets. The CIN profile contained the smallest vesicles, about 30 nm in diameter, of the entire dataset. (D) Box plot showing the density of presynaptic sites for the seven neuronal elements of the ventral lobe (VL). CINs had the highest presynaptic site density of the dataset. Error bar = standard error of the mean.