Microtubles are key to the movement of cells, especially cellular appendages. Cillia and Flagella are the principle appendages concerned with such motion.

Cillia are intracellular structures, as they are within the plasma membrane, however, they are extrusions from the shape of the cell into the surrounding environment. Cillia generally are grouped on the surface of cells, termed Cilliated Cells.

Cilia move in a coordinated way, and with a single motion described as \'oar like\'. The cycle takes about 0.1-0.2 seconds to complete.

Flagella (plural of flagellum) are designed more for cell locomotion, and are also termed intracellular. In most cases these are located behind the cell itself. Beating is by sequential undulations, leading to the propulsion of the cell through a fluid environment.

Structurally, both Cilia and Flagella consist of an Axoneme connected to a Basal Body.