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HE staining observation of each group after operation (×40)
术后各组HE染色观察（×40）
红箭头示新生组织，黑箭头示神经导管 从左至右依次为A、B、C、D组 a. 术后1个月；b. 术后3个月；c. 术后6个月
Red arrow for new tissue, black arrow for nerve conduit From left to right for groups A, B, C, and D, respectively a. One month after operation; b. Three months after operation; c. Six months after operation
