ostium

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，开口于部位额窦窦口周围结构，研究额窦生理、病理，以及提高鼻窦窥镜检查和额窦开放手术具有重要和指导意义。