Twenty eight cases were divided into four groups to undergo main branch and branch of ansa cervicalis nerve anastomosis, and nerves implantation and neuromuscular pedicles transfer respectively for restoration of vocal cord adduction on left sides.

• 建立单侧声带麻痹模型后即刻分别作颈袢主支或分支与喉返神经内收肌支吻合，颈袢主支的亚分支或其肌蒂植入声带内收肌中。