Between labyrinthine segment and horizontal segment there was an angle of 73.5 5.66(70.5-79.6) opening towards posterior, inferior and lateral direction;

• 迷路段与水平段间。 水平段离开膝状神经节后即向下、向后、向外行走，迷路段和水平段形成的向后下外开放的夹角73.；5±5