<prompt> One of the following opens into middle meatus of noseNaso-lacrimal ductEustachian tubeSphenoidal sinusMaxillary sinus  <response>: The middle meatus presents the ethmoidal bulla,the hiatus semilunaris,the infundibulum and the opening of frontal,maxillary and the middle ethmoidal air sinuses.Sphenoidal air sinus opens into the sphenoethmoidal recess,which is a triangular fossa just above the superior concha. REF.BDC VOL.3,5th edition. 