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. 2020 Jan 2;44(1):411–422. doi: 10.1007/s10143-019-01228-8

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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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Fig. 1 — A The impact device for the modified free-fall injury. The rat is fixed through its bilateral external auditory canal. B Pre-impact state of rats. Part of the left parietal skull and meninges have been dissected, and the brain tissue has been exposed. C Rats just before impact. The brain tissue was impacted by a 40-g weight impactor. D Post-impact state of rats. The bruising of the brain was obvious and accompanied by hemorrhage