With the exception of bacteria and archaea, all cells have a complicated, dynamic network of interconnecting protein filaments called the cytoskeleton.
It connects the cell nucleus to the cell membrane and is made up of similar proteins in different organisms.
The cytoskeleton can be divided into three different categories. Intermediate filaments, Microtubules, and Microfilaments
The thickest of the three are microtubules, the thinnest are microfilaments (also known as actin filaments) and the middle-sized intermediate filaments are fibers.
The cytoskeleton in a cell performs a lot of functions, including mechanical support, movement, and maintenance of the cell's shape.
Additionally, it facilitates intracellular movements including the movement of cell organelles and the movement of vesicles into and out of cells.
Therefore, The cytoskeleton is made up of protein filaments.