人颈7神经根干股束支运动纤维含量及其临床意义

A study of the motor fiber counts of the human 7th cervical nerve root and its branches

目的:为临床选择性颈7神经根移位治疗臂丛损伤提供进一步依据。方法:选择6侧新鲜成人尸体臂丛标本,分离颈7神经根干、股及其发出到上肢各主要神经的主要纤维束,并分别进行胆碱酯酶染色。结果:人类颈7神经根含运动纤维约8893根,其中前股3010根,后股5883根;颈7前股中,加入肌皮神经的成分约589根(占肌皮神经总运动纤维约20%),正中神经1931根(占其外侧头70%);颈7后股中,加入腋神经成分611根(占其运动纤维的25%),桡神经4036根(占58％),胸背神经994根(占60％).结论:颈7神经根前后股均有足够的运动纤维量;同侧颈7神经根移位时建议保留前股;采用颈7神经根移位,修复多条受损神经是可行的。

Objective: To investigate the motor fiber counts of the human 7th cervical nerve root and its branches. Methods: The divisions of human C7 were observed in 6 new dead brachial plexus specimens, and the motor fiber counts of the fascicles were analyzed. Results: There were about 8893 motor fibers in C7, 3010 and 5883 in anterior and posterior division respectively. In the anterior division, there were 589 motor fibers in the musculocutaneous nerve (about 20% of the total counts in the nerve ),and 1931 in the median nerve (about 70% in the lateral part of the nerve). In the posterior division, the motor fiber counts joining to axillary nerve, dorsal thoracic nerve and radial nerve were 611 (25%), 994 (58%) and 4036 (60%) respectively. Conclusions: There are enough motor fibers both in anterior and posterior divisions of C7 nerve root. It will be a better choice to reserve anterior division in the episolateral C7 transfer procedure.