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A specialized eukaryotic organelle that consists of a filiform extrusion of the cell surface. Each cilium is bounded by an extrusion of the cytoplasmic membrane, and contains a regular longitudinal array of microtubules, anchored basally in a centriole. A cilium that consists of a 9 + 2 arrangement of microtubules, radial spokes, and a dynein apparatus. Motile cilia, found on cells that line the lumenal ducts of various tissues, beat with a characteristic whip-like pattern that promotes cell motility or transport of fluids and other cells across a cell surface. Any constituent part of a cell, the basic structural and functional unit of all organisms. An immotile primary cilium that may be missing the central pair of microtubules, or the central pair of microtubules and outer dynein arms. Some primary cilia also have altered arrangements of outer microtubules (fewer than nine and/or not always present as doublets). Nonmotile primary cilia typically function as sensory organelles that concentrate and organize sensory signaling molecules. A specialized primary cilium that contains a 9 + 0 arrangement of microtubules, radial spokes, and a dynein apparatus, but no inner doublet microtubules. Motile primary cilia display a distinct twirling motion that directs fluid flow asymmetrically across the cellular surface. A prolongation or process extending from a cell, e.g. a flagellum or axon. Any constituent part of a cilium, a specialized eukaryotic organelle that consists of a filiform extrusion of the cell surface. Each cilium is bounded by an extrusion of the cytoplasmic membrane, and contains a regular longitudinal array of microtubules, anchored basally in a centriole.

View Gene Ontology (GO) Term

GO TERM SUMMARY
Name: cilium
Acc: GO:0005929
Aspect: Cellular Component
Desc: A specialized eukaryotic organelle that consists of a filiform extrusion of the cell surface. Each cilium is bounded by an extrusion of the cytoplasmic membrane, and contains a regular longitudinal array of microtubules, anchored basally in a centriole.
Proteins in PDR annotated with:
   This term: 124 [Search]
   Term or descendants: 221 [Search]


[geneontology.org]
INTERACTIVE GO GRAPH

GO:0005929 - cilium (interactive image map)
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