Cellular component

GO:0035085, GO:0035086

ciliary axoneme, cilium axoneme, flagellar axoneme, flagellum axoneme

The bundle of microtubules and associated proteins that forms the core of cilia (also called flagella) in eukaryotic cells and is responsible for their movements.

Note that cilia and eukaryotic flagella are deemed to be equivalent. In diplomonad species, such as Giardia, the axoneme may extend intracellularly up to 5um away from the plane of the plasma membrane.