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环构侧肌是声带的内收肌之一，但部分学者认为该肌的外侧缘参予了外展活动。该作者应用Sihter氏染色法对5例成人喉标本进行研究，观察肌内神经支配类型，探讨环构侧肌内部是否具有不同的功能性成分。结果：标本的环构侧肌神经分支均以单一的束起自喉返神经（RLM）的前部，从RLM
Circumferentialis is one of the adducts of the vocal cord, but some scholars believe that the lateral margin of the muscle is involved in outreach. The author used Sihter’s staining method to study 5 adult laryngeal specimens and observed intramuscular nerve innervation types to investigate whether there are different functional components in the circumflex muscle. RESULTS: The circumflex lateral nerve branches of the specimens were singulated from the anterior part of the RLM,