By using collodion embedding and thin sectioning at coronal and axial planes in ten cadaver heads, structure and location of the LSW were observed with light microscope.

• 用火棉胶包埋10例标本,对蝶窦外侧壁相关结构的区域进行冠状、水平位的薄层切片,观察各层面结构和位置。