1.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.

1.认为，开口于部位的窦窦口周围结构，研究窦的、，以及提高鼻窦内窥镜检查和窦开放手术具有重要的参考和指导意义。