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Flagellum
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Take a microscopic look at how a eukaryotic flagellate's flagellum propels the organism through water
Salmonella Vibrio Labeled diagram of a bacillus-shaped bacterial cell showing capsule, cell wall, cell membrane, cytoplasm, nuclear matter, pili, and a single long flagellum extending from one end. Labeled diagram of a bacterial cell showing key structures including capsule, cell wall, plasma membrane, cytoplasm, chromosome, plasmid, ribosomes, mesosome, pili, and long flagella. Illustration comparing three cell types: a round animal cell and an irregularly shaped plant cell, both showing labeled organelles, and an elongated bacteria cell with labeled structures such as flagella and capsule.
Analyze the structure and motion of cilia and flagella

Flagellum: References & Edit History

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  • The Editors of Encyclopaedia Britannica
    Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.

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Article History

Type Description Contributor Date
Article title updated for style. Nov 11, 2026
Add new Web site: CiteSeerX - Flagellar movement of the sessile flagellates Actinomonas, Codonosiga, Monas, and Poteriodendron (PDF). Apr 05, 2025
Add new Web site: Cell Press - Current Biology - Flagellum Length Control: How Long Is Long Enough? (PDF). Feb 20, 2025
Add new Web site: PNAS - Dynamic motors for bacterial flagella. Sep 02, 2024
Add new Web site: CORE - The Bacterial Flagellum: From genetic network to complex architecture. Jun 10, 2024
Add new Web site: Biology LibreTexts - Flagella. Dec 01, 2023
Add new Web site: National Center for Biotechnology Information - PubMed Central - The Role of the Bacterial Flagellum in Adhesion and Virulence. Oct 05, 2023
Add new Web site: University of Illinois at Urbana-Champaign - Theoretical and Computational Biophysics Group - Bacterial Flagellum. Mar 01, 2016
Added an image of the flagellated bacterial species Salmonella typhimurium. Aug 14, 2015
Article revised and updated. Oct 17, 2007
Article added to new online database. May 03, 1999
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