All open into middle meatus except
Frontal sinus
Sphenoid sinus
Maxillary sinus
Ethmoidal sinus
THE FOLLOWING FEATURES ARE: 1.Ethmoidal bulla 2.Hiatus semilunaris 3.Infundibulum 4.Opening of frontal air sinus 5.Opening of anterior ethmoidal sinus 6.Opening of maxillary sinus Ref BDC volume 3,sixth edition pg 243
Head and neck