Cilium
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The cilium is a short hair-like membrane protrusion from many types of eukaryotic cell. The cilium has the shape of a slender threadlike projection that extends from the surface of the much larger cel
SEM micrograph of motile cilia projecting from respiratory epithelium in the trachea
Tracheal respiratory epithelium showing cilia and much smaller microvilli on non-ciliated cells in scanning electron micrograph
Scanning electron micrograph of nodal cilia on a mouse embryo
Respiratory epithelium
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Respiratory epithelium, or airway epithelium, is ciliated pseudostratified columnar epithelium a type of columnar epithelium found lining most of the respiratory tract as respiratory mucosa, where it
Cilium
…cilia. Non-motile cilia that have a central pair of microtubules are the kinocilia present on hair cells. Motile cilia are found in large numbers on respiratory epithelial cells – around 200 cilia per cell, where they function in mucociliary clearance, and also have mechanosensory and chemosensory functions. Motile cilia on…
Cross-section of pseudostratified columnar epithelium
Second cross-section