A non-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).
Source:
GOC:cilia,
PMID:22118931,
PMID:21307074
Comment
This type of cilia may be present in solitary (e.g. in inner hair cells) or in multiple copies (e.g. in olfactory neurons).