主要观察指标：臂丛神经上干的拉伸力学性质和黏弹性力学性质。
MAIN OUTCOME MEASURES: mechanical characters of elongation and mechanical characters of viscoelasticity of superior trunk of brachial plexus nerve.
对臂丛神经上干进行应力松弛实验和蠕变实验，得出应力松弛、蠕变实验数据和曲线。
Superior trunk of brachial plexus nerve was performed stress relaxation test and creeping test, and data and curve of stress relaxation test and creeping test were obtained.
创伤后臂丛神经麻痹往往累及臂丛上干，导致肩部肌肉的麻痹。
Posttraumatic brachial plexus paralysis invariably involves the upper roots leading to paralysis of the shoulder region musculature.
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