Most epithelial cells lining the trachea are provided at their apical pole with motile cilia (kinocilia). Each cilium originates from a basal body (BB) which can be seen here as a dense ring-like structure in the apical cytoplasm. Cilia (Ki) extend in the tracheal lumen and each displays the characteristic 9+1 microtubular doublets. Slender microvilli (Mv) are present in between cilia. Notice the dense boundary limits between the epithelial cells at the level at which one can find tight junctions (TJ). Tracheal epithelium contains also goblet cells.
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