Fig. 1.

Oral mucous membrane containing a dense network of initial lymphatics. a Initial lymphatics are localized in a subepithelial position in the tongue (to), gingiva, cheek with buccinator muscle (bu) and palatine (pa). Dental pulp (arrows) does not contain lymphatics. Magnification ×20. Bar 400 μm. b Root of the tongue (to) and palatine (pa) with a subepithelial lymphatic network. Magnification ×40. Bar 200 μm. c Lymphatics along the lingual artery (a). Magnification ×200. Bar 50 μm. d Lymphatic vessel (arrow) accompanying the inferior alveolar artery (a) and nerve (n). Magnification ×100. Bar 100 μm. e Dendritic cells in dental pulp are weakly positive for Lyve-1 (d dentin, od odontoblasts). Magnification ×100. Bar 100 μm