All open into middle meatus except ?
Ans. is 'b' i.e., Sphenoid sinus Pa of lateral nasal wallOpeningsInferiorNasolacrimal ductMiddleFrontal sinus, Maxillary sinus, Anterior ethmoidal sinusSuperiorPosterior ethmoidal sinusSphenoethmoidal recessSphenoid sinus
Frontal sinus
Sphenoid sinus
Maxillary sinus
Ethmoidal sinus