Fig. 1.

3D reconstruction and epithelial distribution of the nasopharynx of a tree shrew (HE sections magnification 400×). (A) and (B) show the 3D reconstruction of the nasopharynx from two different perspectives. As shown in Fig. 1A, the bottom wall of the nasopharynx was removed to better display the structures of the nasopharyngeal roof and posterior wall. Different colors and numbers are used to label the epithelium of different tissue types in the model. The short ciliary epithelium is labeled in pink (a); the long ciliary epithelium is labeled in yellow (b); the pseudostratified ciliated epithelium is labeled in red (c); the tonsil region is labeled in light blue (d); and the stratified squamous epithelium is labeled in dark blue (e). The corresponding HE images are on the right side of Fig. 1, and the same colors and lowercase letters are used to label the small squares in the upper left corner of each image