缺血后脑的病理改变以神经细胞变性、固缩和退变，皮层下白质的神经纤维和髓鞘溃变为主，普遍存在胶质细胞增生，形成胶质小结。
There were obvious pathological change in the brain after the chronic cerebral hypoperfusion, such as myelinic degeneration and formation of glial nodule in white matter.
切断肠系膜下神经节发出的分支，光镜下见节内存在溃变神经纤维；
The nerves between the inferior mesenteric ganglion and the colon were cut off.
结论：大鼠脊髓损伤早期局部应用PEG可以有效减轻神经纤维的溃变。
Conclusion: Topical application of PEG at the early stage after spinal cord injury can effectively protect the axons from degeneration.
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