1. Flagella: Long, whip-like structures that propel cells in a wave-like motion. Found in bacteria, sperm cells, and some protists.

2. Cilia: Short, hair-like structures that beat rhythmically to move fluid or propel the cell. Found in many eukaryotic cells, including respiratory cells and some protists.

3. Pseudopodia: Temporary projections of the cell membrane that allow for amoeboid movement. Found in amoebas and other cells that exhibit this type of movement.

4. Microtubules and Microfilaments: These protein filaments form the cytoskeleton, which provides structure and support to the cell. Microtubules are involved in the movement of cilia and flagella, while microfilaments are involved in amoeboid movement and cytoplasmic streaming.

5. Cell Wall: In plant cells, the rigid cell wall provides structural support and can influence cell movement, particularly during growth.

6. Extracellular Matrix (ECM): In animal cells, the ECM is a network of proteins and carbohydrates that surrounds the cell. It can influence cell movement by providing a framework for migration and by signaling pathways.

The specific structure involved in cell movement depends on the type of cell and its function.