(from the article `adenoids`) The surface layer of the adenoids consists of ciliated epithelial cells covered by a thin film of mucus. The cilia, which are microscopic hairlike ... ...the brain. Squamous, or flattened, epithelial cells, very thin and irregular in outline, occur as the covering epithelium of the alveoli of the ... [2 ... Found on http://www.britannica.com/eb/a-z/c/85