All open into middle meatus except: (A) Frontal sinus, (B) Sphenoid sinus, (C) Maxillary sinus, (D) Ethmoidal sinus
Answer is B. 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