Translation of "Folds" in Japanese

We've got the mouthpiece -- that's the vocal folds --

マウスピースが声帯ヒダにあたり

And left you as a torso with just your vocal folds vibrating,

胴体だけ残して 声帯ヒダのみを振動させたら

If a sick person folds one thousand paper cranes, her wish will come true.

もし病気の人が千羽の鶴を折ると、その人の願いが叶うの。