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. 2020 Nov 20;5:21. doi: 10.1038/s41536-020-00101-3

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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 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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Fig. 8 — Sunderland grade III, axons and the endoneurium were damaged, but not the perineurium. After nerve crush injury, PRP delivers multiple neurotrophic factors (NGF, BDGF, IGF-1, PDGF, VEGF, HGF, etc). This new microenvironment gives way to the survival, proliferation and differentiation of SCs and further promotes the release of neurotrophic factors by SCs. At the same time, promoting vascularization along the fibrin cable precedes axon regeneration.