下列何者構成弓狀線(arcuate line)下方腹直肌前的鞘膜(rectus sheath anterior to the rectus abdominis)? ①Scarpa's fascia ②腹外斜肌(external abdominal oblique muscle)的腱膜(aponeurosis) ③腹內斜肌(internal abdominal oblique muscle)的腱膜 ④腹橫肌(transversus abdominis)的腱膜
①
僅②
僅②③
②③④