The adjacent structures of the ostia differ from each other by the different location of the ostium.The clinical significance of the ostium and the nasofrontal duct were discussed.

认为，开口于不同窦窦口周围结构不同，对研究窦生理、病理，以及提高鼻窦内查和窦开放手术具有重要参考和指导意义。