Posterior ethmoidal sinus opens into
The posterior ethmoidal air sinus consisting of 1-7 air cells open into the superior meatus of the nose. It is supplied by the posterior ethmoidal nerve and vessels and the orbital branches of pterygopalatine ganglion. Ref BDC volume 3,6th edition pg 246
Superior nasal meatus
Middle nasal meatus
Inferior nasal meatus
Sphenoethmoidal recess
Head and neck