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，开口于不同部位的窦窦口周围结构不同，对研究窦的生理、病理，以及提高鼻窦内窥镜检查和窦开手具有重要的参考和指导意义。