An elaborate network of filamentous proteinaceous structures...

The cytoplasm of all eukaryotic cells is criss-crossed by a network of protein fibres that support the shape of the cell and anchor organelles to fixed locations. This network is called cytoskeleton. It consists of three types of cytoskeletal filaments namely act filaments or microfilaments (formed of globular protein actin), microtubules (formed of tubulin protein) and intermediate filaments (formed of variety of proteins like vimentin, keratin, desmin, peripherin, lamin, etc).