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目的探讨中国人群正中神经-尺神经吻合(Martin-Gruber anasmotosis,MGA)情况及其对尺神经损伤法医学鉴定的影响。方法通过105例中国人上肢正中神经、尺神经解剖,观察MGA变异情况,对MGA的分型、走行及位置等进行分析,了解该变异对尺神经损伤法医学鉴定的影响。结果105例中发现24例MGA,MGA出现率为22.9%,男性出现率略高于女性,单双侧及左右侧无明显个体差异。24例MGA中,I型>Ⅱ型>Ⅳ型>Ⅲ型(分别占45.8%,25%,16.7%和12.5%)。正中神经起始点位于内外髁连线上4.11cm至连线下9.95cm,平均前臂连线下3.05cm;尺神经止点位置均在连线3cm以远,最远至连线下14.7cm,平均连线下8.05cm。结论中国人群存在MGA的位置多见于尺神经损伤的常见部位,对尺神经损伤的法医学鉴定有一定的影响。
Objective To investigate the effect of midline nerve-ulnar anastomosis (MGA) on forensic identification of ulnar nerve injury in Chinese population. Methods 105 cases of Chinese upper extremity median nerve and ulnar nerve anatomy were observed MGA variation, MGA classification, walking and location were analyzed to understand the variation of ulnar nerve injury forensic identification. Results Twenty-four cases of MGA were found in 105 cases. The incidence of MGA was 22.9%. The incidence of MGA in women was slightly higher than that in women. There was no significant difference in single, bilateral and bilateral. Among the 24 MGA cases, type I> type II> type IV> type III (45.8%, 25%, 16.7% and 12.5%, respectively). Median nerve starting point is located in the medial and lateral condylar line 4.11cm to 9.95cm under the line, the average arm under the line 3.05cm; ulnar nerve end point in the line 3cm beyond the farthest to the line 14.7cm, the average 8.05cm under the connection. Conclusion The presence of MGA in Chinese population is more common in the common sites of ulnar nerve injury and has certain influence on forensic identification of ulnar nerve injury.