Cytoskeleton The Cytoskeleton 1. The cytoskeleton consists of intermediate filaments, microtubules, and microfilaments.
Microtubules are tubules made of dimers of a and b tubulin units.
Spindle fibers in dividing cells and eukaryotic cilia and flagella are examples of where microtubules can be used. In animal cells, microtubules grow out from the centrosome, an organizing center next to the nucleus. The centrosome contains a pair of centrioles and nucleating sites from which microtubules grow. Dynamic instability of microtubule growth helps explain how organelles can be linked by microtubules. The unstable end of the microtubule is no longer unstable if it can attach to something.