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Top 10 facts about the world. The cytoskeleton is an important part of the cell structure. It spans the cytoplasm to provide support, shape, elasticity, and protection to the contents of the cell, much like the larger skeleton found in many living organisms.
This structure acts as both muscle and skeleton, for movement and stability. The long fibers of the cytoskeleton are polymers of subunits. The primary types of fibers comprising the cytoskeleton are microfilaments, microtubules, and intermediate filaments. Microfilaments are fine, thread-like protein fibers, 3-6 nm in diameter.