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. 2022 Aug 12;15:911476. doi: 10.3389/fnmol.2022.911476

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Copyright © 2022 Liang, Chen, Yang, Yang, Yu, Yang, Wang, Wang, Sun and Chen.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Ultrastructural evidence for retrograde degeneration of spinal dorsal horn neuronal cell bodies and altered synaptic structures. (A) A normal neuronal cell body and adjacent synaptic structures 7 days after ITS. (B) A degenerating neuronal cell bodies with altered nucleus, damaged cell membranous structures and mitochondrial swelling, vesiculation, and disappearance of the crista and altered synaptic structures 7 days after ITC. A, axon; D, dendrite; DS, dendritic spine; m, mitochondrion; my, myelin; N, nucleus; ↑asymmetric synapse;↑↑symmetric synapses. (C) Averaged number of normal neuronal cell bodies (NC) and degenerative neuronal cell bodies (DC) from the spinal dorsal horn following 7 days after ITC or ITS. **p < 0.01, ITC vs. ITS, n = 3 rats/group, with nine ultrathin sections being observed and counted from each rat.