Title: Transitional zone in the middle part of nasal vestibulum
Stain Azan, human. This area is comparable with the red zone or vermilion border of the lip.
At the right slightly cornified squamous epithelium (1) with small dermal papillae (2) and numerous blood vessels (3).
To the left the transition to pseudostratified epithelium (4). In the submucosa branching seromucous nasal glands with draining ducts (5).
Title: Respiratory region of nasal vestibulum
Stain Azan, human. At the top pseudostratified, ciliated epithelium (1) with a distinct endoepithelial gland (2, pink-stained mucous cells).
The proper lamina is cell-rich and draining ducts (3, enclosed by thicker blue-stained borders) and acini of the nasal glands (5) are present here as well as in the submucosa (4, heavier deposits of thicker blue-stained collagen fibers).
Keywords/Mesh: respiratory system, nasal cavity, pseudostratified epithelium, seromucous gland, endoepithelial gland, nasal gland, histology, POJA collection