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１５例患者行健侧颈７神经根移位术时，对其正常臂丛神经根进行了肌电生理检测（刺激各神经根，在上肢１２组肌肉内记录最大波幅值）。结果证实臂丛神经根的肌肉机能支配如下：颈５主要组成腋神经支配三角肌。颈６主要组成肌皮神经支配肱二头肌。两者共同支配肩肘的功能。支配的肌群有密切的相关性，只是支配肌群的次序有所不同。颈７主要组成桡神经支配肱三头肌。参与肩、肘、腕及手部功能的支配。颈８主要组成正中神经支配屈指肌群。胸１主要组成尺神经支配手内部肌。两者以共同支配手部的肌群为主。支配的肌群有密切的相关性，只是支配肌群的次序不同而已。作者认为颈７神经根的支配特殊性，为临床上行健侧颈７神经根移位提供了解剖学依据。也为今后开展其他颈神经根的移位，提供了解剖学依据。
Fifteen patients underwent contralateral cervical 7 nerve root transposition, and their normal brachial plexus roots were examined by EMG (each nerve root was stimulated, maximum amplitude was recorded in the muscle of 12 upper limbs). The results confirm that the muscular function of the brachial plexus root dominates as follows: The neck 5 predominantly comprises the axillary nerves that govern the deltoid muscles. Neck 6 mainly composed of musculocutaneous nerve biceps. Both together support the function of shoulder and elbow. Dominated muscle groups are closely related, but the order of the dominant muscle group is different. Neck 7 mainly composed of radial nerve triceps. Participate in the shoulder, elbow, wrist and hand control of the function. Neck 8 mainly composed of the median nerve deformer muscle group. Chest 1 mainly composed of ulnar nerve inner hand muscle. Both dominate the hand muscles. Dominated the muscle groups are closely related, but the order of the dominant muscle group only. The authors believe that the dominant nature of the cervical 7 nerve root provides an anatomical basis for the clinical uplift of the nerve root of the contralateral neck 7. It also provides an anatomical basis for carrying out the displacement of other cervical nerve roots in the future.