A cytoskeleton-like structure, originating from the basal body at the proximal end of a cilium, and extending proximally toward the cell nucleus. Rootlets are typically 80-100 nm in diameter and contain cross striae distributed at regular intervals of approximately 55-70 nm. [ GOC:cilia http://www.ncbi.nlm.nih.gov/pubmed/12427867 ]
Synonyms: cilium rootlet cilial rootlet