ostia

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，开口于部位的额窦窦口周围结构，研究额窦的生理、病理，以及提高鼻窦内镜检查额窦开放手术具有重要的参导意义。