The cytoskeleton is responsible for the way a cell moves and is shaped. The cytoskeleton is attached to different parts of the cell membrane by proteins in it and pull on it like a muscle pulls on bones to move them, it's also how white blood cells can maneuver through tight spaces to get to bacteria. The cytoskeleton also anchors oraganelles in place and moves them around to other parts of the cell where they may be needed. In 1903 Nikolai Koltsov said a cells structure was comprised of tubules which he eventually named the cytoskeleton.
Structure
The cytoskeleton is a key factor in how a cell is shaped and how rigid or fluid it is. There are three main groups that contribute to the architecture of a cell: microtubules, actin filaments, and intermediate filaments, which are all protein filaments like muscle fibers. All the filaments are polymers made up of protein subunits. The cytoskeleton also helps with transport of materials through the cell and not just structure. The organelles that are responsible for moving material through the cell are called: kinesin, dynein, and myosin, which are known as movers or mover proteins, and are cytoskeleton structures.