The cytoskeleton is a network of microfilaments, intermediate filaments, and microtubules. Microtubules Microtubules are hollow tubes made of subunits of tubulin protein . They provide structural support for the cell and play a role in cell division, cell movement, and movement of organelles within the cell . Microfilaments Microfilaments are solid, rodlike structures composed of actin . They provide structural support, and play a roll in phagocytosis, cell and organelle movement, and cell division .
Intermediate filaments are tough fibers made of polypeptides .
They help to strengthen the cytoskeleton and stabilize cell shape . Centrioles Centrioles are located near the nucleus and appear as cylindrical structures consisting of a ring of nine evenly spaced bundles of three microtubules . Centrioles play a role in the formation of cilia and flagella. During animal cell division , the mitotic spindle forms between centrioles . Both consist of 9 fused pairs of protein microtubules with side arms of the motor molecule dynein that originate from a centriole.