• The eukaryotic cytoskeleton is made up of a network of long, thin protein fibers.
  • It helps to maintain cell shape and holds organelles in place.
  • It also plays important roles in both the intracellular movement of substances and in cell division.
  • Three main kinds of cytos skeleton fibers are microtubules, intermediate filaments, and microfilaments.
  • Microtubules are hollow cylinders made of polymers of alpha and beta tubulin.
  • Intermediate filaments made of the protein keratin are found in skin, hair, and nails cells.
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