<prompt> Ethmoidal sinus opens into which of the followingHiatus semilunarisMiddle meatusSuperior meatusAll of the above  <response>: The anterior ethmoidal air sinus is opened into the anterior pa of the hiatus semilunaris The middle ethmoidal air sinus is opened into the middle meatus of the nose The posterior ethmoidal air sinus is opened into the superior meatus of the nose 