One of the following opens in the middle meatus of the nose
The middle meatus lies underneath the middle concha.it presents the following features: 1.the ethmoidal bulla is a rounded elevation produced by the underlying middle ethmoidal sinuses which open at upper margin of bulla. 2. Hiatus semilunar 3. Infundibulum 4. The opening of maxillary air sinus is located in posterior pa of the hiatus semilunaris.it is often represented by two openings. 5. The opening of the anterior ethmoidal air sinus is present behind the opening of frontal air sinus 6. The opening of frontal air sinus is seen in the anterior pa of hiatus semilunar Ref.BDC volume 3.Sixth edition pg 243
Naso-lacrimal duct
Eustachian tube
Sphenoidal air sinus
Maxillary air sinus
Head and neck