A single flagellum can extend from one end of the cell - if so, the bacterium is said to be monotrichous.
2. A single flagellum (or multiple flagella; see below) can extend from both ends of the cell - amphitrichous.
3. Several flagella (tuft) can extend from one end or both ends of the cell - lophotrichous; or,
4. Multiple flagella may be randomly distributed over the entire bacterial cell - peritrichous.