Axial filament

Definition

An axial filament is a structure composed of multiple flagella that are wrapped around the cell body of spirochetes, allowing them to move in a corkscrew motion. This unique form of motility is essential for the bacteria's ability to navigate through viscous environments.

5 Must Know Facts For Your Next Test

1. Axial filaments are found in spirochetes, a group of spiral-shaped bacteria.
2. They are located between the outer sheath and the cell wall, providing the bacterium with its characteristic twisting motion.
3. The corkscrew motion facilitated by axial filaments helps spirochetes move through thick, viscous media such as mucus or tissue.
4. Treponema pallidum, the causative agent of syphilis, uses axial filaments for motility.
5. Axial filaments are similar in structure to flagella but differ in their location and function within the bacterial cell.

Review Questions

Related terms

Spirochete: A group of spiral-shaped bacteria known for their unique mode of movement using axial filaments.

Flagellum: A whip-like structure that enables many protozoa, bacteria, and spermatozoa to swim.

Treponema pallidum:

A species of spirochete bacterium that causes syphilis and relies on axial filaments for motility.