Methods: To observe types of the thoracodorsal nerve branches and locate entrance points of muscularnerve in 60 cases.
方法：观察60侧背阔肌的胸背神经分支类型并定位神经入肌点。
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Objective: To provide anatomical basis for transferring of free musculocutaneous flap and muscularnerve branches of lateral head of triceps brachii(LHT).
目的：为肱三头肌外侧头的神经肌支移位和游离肌皮瓣移植提供解剖学基础。
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CONCLUSION: Target muscular injection of methyl cobalamin can promote the regeneration of peripheral nerve, and methyl cobalamin of high dosage can better play its role in nourishing injured nerve.