The cytoskeleton (also CSK)'s a cellular "scaffolding" or "skeleton" contained within the cytoplasm. The cytoskeleton's present in all cells; it was once thought this structure was unique to eukaryotes, but recent research has identified the prokaryotic cytoskeleton. It's a dynamic structure that maintains cell shape, protects the cell, enables cellular motion (using structures such as flagella, cilia and lamellipodia), and plays important roles in both intracellular transport (the movement of v… (More on Cytoskeleton)