Cellular component

motile 9+2 cilium

A motile cilium where the axoneme has a ring of nine outer microtubule doublets plus two central microtubules (and is therefore called a 9+2 axoneme).

This type of cilia may be present in solitary (so-called flagella, e.g. in sperm) or in multiple copies (so-called conventional motile cilia, e.g. in tracheal epithelium, ependyma or oviduct epithelium).