Editing Cilium (section)

===Axoneme===
Inside a cilium is a [[microtubule]]-based [[cytoskeleton|cytoskeletal core]] called the [[axoneme]].  The axoneme of a primary cilium typically has a ring of nine outer microtubule doublets (called a [[9+0 axoneme]]),  and the axoneme of a motile cilium has, in addition to the nine outer doublets,  two central microtubule singlets (called a [[9+2 axoneme]]). This is the same axoneme type of the [[flagellum]]. The axoneme in a motile cilium acts as a scaffold for the inner and outer [[dynein arm]]s that move the cilium, and provides tracks for the [[microtubule motor]] [[motor protein|proteins]] of kinesin and dynein.<ref name="HHMIB2005"/><ref>{{cite journal | vauthors = Rosenbaum JL, Witman GB | title = Intraflagellar transport | journal = Nature Reviews. Molecular Cell Biology | volume = 3 | issue = 11 | pages = 813–25 | date = November 2002 | pmid = 12415299 | doi = 10.1038/nrm952 | s2cid = 12130216 }}</ref><ref>{{cite journal | vauthors = Scholey JM | title = Intraflagellar transport motors in cilia: moving along the cell's antenna | journal = The Journal of Cell Biology | volume = 180 | issue = 1 | pages = 23–29 | date = January 2008 | pmid = 18180368 | pmc = 2213603 | doi = 10.1083/jcb.200709133 }}</ref> The transport of ciliary components is carried out by [[intraflagellar transport]] (IFT) which is similar to the [[axonal transport]] in a [[axon|nerve fibre]]. Transport is bidirectional and [[Motor protein#Cytoskeletal motor proteins|cytoskeletal motor proteins]] kinesin and dynein transport ciliary components along the microtubule tracks; kinesin in an anterograde movement towards the ciliary tip and dynein in a retrograde movement towards the cell body. The cilium has its own ciliary membrane enclosed within the surrounding [[cell membrane]].<ref>{{cite journal | vauthors = Rohatgi R, Snell WJ | title = The ciliary membrane | journal = Current Opinion in Cell Biology | volume = 22 | issue = 4 | pages = 541–46 | date = August 2010 | pmid = 20399632 | pmc = 2910237 | doi = 10.1016/j.ceb.2010.03.010 }}</ref>