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. 2019 Feb 14;9:2005. doi: 10.1038/s41598-019-39645-w

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© The Author(s) 2019

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Morphological analysis of HPC neuron dendritic arborizations. When a random sample of all animals is considered (older = 27; younger = 15). (a–c) Comparison of dendritic lengths of DG granular, CA3 and CA1 pyramidal neurons between younger and older rats. (d) Correlation between granular neuron dendritic lengths and individual performances in the reference memory task of both younger and older rats. When similar age animals are clustered (see methods for details) in GPs and BPs according to reference memory performance (older GPs = 16 (18 for CA1); older BPs = 8 (9 for CA1); younger GPs = 10; younger BPs = 5). (e) Average dendritic lengths for both GPs and BPs of younger and older animals. (f) Sholl analysis of the apical dendrite of DG granular neurons. This graph presents the mean number of intersections of apical dendritic branches with consecutive 20 µm spaced concentric spheres. (g) Representative reconstructions of DG granular neurons used in the previous analysis. (h–k) The same analysis was performed for CA3 pyramidal neurons and in (l–o) for CA1 pyramidal neurons. Error bars represent SEM, doted lines represent confidence intervals and continuous lines are linear fits; *p < 0.05; **p < 0.01; ***p < 0.001. (RM – reference memory).