臂丛颈7神经根支配主要代表肌的电生理研究

目的 通过电生理检测分析臂丛颈,神经根的主要代表肌.方法 选择16例臂丛神经根性撕脱伤行健侧颈7神经根移位的患者,术中采用电生理检测,对颈7神经根支配肌的波幅进行分析,确定颈7神经根的主要代表肌.结果 电生理检测表明背阔肌与肱三头肌长头均可较好地代表颈7神经根的功能.尤其是肱三头肌长头在所有16例患者的检测中,刺激颈7神经根所得复合肌肉动作电位(CMAP)波幅值均明显大于其余神经根所得波幅值;而背阔肌有4例(占25.0%),在刺激颈6神经根时所得CMAP波幅值与颈,神经根接近.结论 将肱三头肌长头、背阔肌作为定位颈,神经根的代表肌更具有合理性与科学性.

Electrophysiologic study of C7 nerve root innervated muscles

Objective To analyze the representative muscles innervated by C7 nerve root via electrophysiologic testing. Methods Sixteen patients of root avulsions of the brachial plexus who underwent eontralateral C7 tranafer were involved in the study. Intra-operatively compound muscle action potentials CMAPs in various upper limb muscles were recorded while C7 nerve root was stimulated. Amplitudes of CMAPs were measured and compared to determine the representative muscles of the C7 nerve roor Results Electrophysiologic data showed that lattiaaimus dorsi muscle and triceps brachii muscle best represent function of the C7 nerve root. In all 16 cases stimulation of C7 resulted in higher CMAP amplitude in long head of the triceps than when any other nerve root was stimulated. CMAP amplitude of lattissimus dorsi muscle elicited by C6 stimulation was similar to that elicited by C7 stimulation in 4 cases (25.0%). Conclusion Long head of the triceps and lattissimus dorsi muscle are representative muscles of C7 nerve root.