Throughout the cytoplasm of the eukaryotic cell is a network of microtubles. Cylindrical microtubules are about 25 nm in diameter and lengths range from 200 nm to about 25 micrometers(1). These tubules form part of the cytoskeleton that gives the cell structure and shape. They are also components of cilia and flagella. The microtubule network provides a transportation aid for moving organelles within the cell.
Hickman, et al.