The cytoskeleton is made up of a network of protein filaments that extends throughout the interior of the cell to the interior of the plasma membrane. It is not a permanent structure, but a dynamic one, continually breaking down and rebuilding according to cellular needs.
The cytoskeleton is made up of:
- Actin microfilaments or filaments, typical of muscle cells.
- Microtubules that are scattered in the hyaloplasm or forming more complex structures, such as the achromatic spindle.
- Intermediate filaments such as keratin filaments typical of epidermal cells.
These filaments appear associated with other proteins, originating more complex structures, allowing cell movements, such as muscle contraction, produced by actin filaments, and the movement of cilia and flagella, which depend on microtubules.