Ethmoidal sinus opens into which of the following
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 <img src=" /> Ref BDC volume 3,6th edition pg 246
Hiatus semilunaris
Middle meatus
Superior meatus
All of the above
Head and neck