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. 2018 Nov 19;8:17042. doi: 10.1038/s41598-018-35425-0

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© The Author(s) 2018

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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Sagittal sections of the 3D morphology of the ORL reconstructed from mCT images. The sectional planes were located at the medial (a), central (b) and lateral (c) portions of an ORL specimen. The retro-orbicularis fibres of the ORL (green) pierced the OOc (OOc, red). The upper fibres (arrow) pierced the palpebral and orbital portions of the OOc. The lower fibres (arrowheads) pierced the orbital portion of the OOc. The lowermost preorbicularis fibres (#) attached to the prezygomatic skin are shown in (b), (c) and (d). (d) Sagittal section of the lateral portion of another ORL specimen showing the uppermost fibre originating from the orbital septum (yellow).