A non-motile cilium where the axoneme has a ring of nine outer microtubule doublets but no central microtubules (and is therefore called a 9+0 axoneme). [ GOC:cilia http://www.ncbi.nlm.nih.gov/pubmed/22118931 ]
Synonyms: non-motile 9+0 cilium 9+0 immotile cilium
Term information
This type of cilia may be present in solitary (authentic primary cilia in many cell types) or in multiple copies (e.g. in Grueneberg ganglion neurons).