The superior meatus, the smallest of the three meatuses of the nose, occupies the middle third of the lateral wall of the nasal cavity

Nasal cavity

The nasal cavity is a large air filled space above and behind the nose in the middle of the face.- Function :The nasal cavity conditions the air to be received by the other areas of the respiratory tract...

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It lies between the superior nasal conchæ and middle nasal conchæ; the sphenopalatine foramen

Sphenopalatine foramen

The sphenopalatine foramen is a foramen in the skull that connects the nasal cavity with the pterygopalatine fossa.-Structure:The processes of the superior border of the palatine bone are separated by the sphenopalatine notch, which is converted into the sphenopalatine foramen by the under surface...

 opens into it behind, and the posterior ethmoidal cells in front.

The sphenoidal sinus opens into a recess, the sphenoethmoidal recess

Sphenoethmoidal recess

The sphenoethmoidal recessis a small space posterior and superior to the superior concha into which the sphenoidal sinus opens.-External links: - "The turbinates have been cut and removed to illustrate the meatus and openings into them."...

, which is placed superior to and posterior to the superior concha.