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. 2020 Sep 3;10:14523. doi: 10.1038/s41598-020-71316-z

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© The Author(s) 2020

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 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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The course of both Achilles tendon (AT) and plantar fascia (PF) collagen fascicles is depicted. (A) A dissected AT is shown from dorsally. The black arrows indicate a collagen bundle running from proximal medial to distal lateral in the superficial AT layer. In contrast, the white arrows indicate that the most medial superficial fascicles of the proximal AT stay medial in the distal part of the AT. (B) A plantar view on the most inferior tip of the calcaneus (CAL) is displayed with the inserting lateral (LB) and central bundle (CB) of the PF. The white arrows point on collagen fibres that originate from the medial CAL taking a course towards the LB. Inversely, a number of fibres can be observed taking a medially directed course (indicated by the black arrows). The white asterisk indicates a bony artefact. (C) A plantar view on the CAL is displayed at a slightly more proximal level compared to B. Focusing on the trabecular architecture, the black arrows indicate representative trabeculae that take a lateromedial course, similar to the more distal fibres of the CB shown in B. Similarly, the white arrows highlight representative trabeculae that are in line with the orientation of the LB. (D) An overview of the slice shown in B is depicted, showing the CB and LB originating from the CAL taking a distal course (view from plantar). Directions A-C: indicated by a cross; d, distal; l, lateral; m, medial; p, proximal.