26 圖中 A、B 所指的是下列那兩個構造?
(A)後環杓肌(posterior cricoarytenoid muscle)及喉返神經(recurrent laryngeal nerve)
(B)側環杓肌(lateral cricoarytenoid muscle)及喉返神經(recurrent laryngeal nerve)
(C)橫環杓肌(transverse cricoarytenoid muscle)及喉返神經(recurrent laryngeal nerve)
(D)環甲肌(cricothyroid muscle)及上喉神經(superior laryngeal nerve)