CILIATED EPITIIELIA ULTRASTRUCTURE 



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..: ■ MU 



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BM 



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Fig. 1. Longitudinal section of the pseudostratified columnar epithelium of the 

 human trachea composed of ciliated cells (C), mucous cells (G), brush cells (BC), 

 and basal cells (B). At the top is the tracheal lumen with the mucous blanket (MU); 

 at the bottom, the basement membrane (BM) with its abundant reticular and collag- 

 enous fibrils. Only the basal cells rest on the basement membrane. Intercellular spaces 

 (I) are evident, and a wandering cell, presumably a lymphocj-te (L), is located in 

 the space between the basal cells. Magnification 1,800X 



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