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Undulating membrane



A sinuous extension of the cytoplasmic membrane performing a vigorous, wavelike, and reversible movements


Undulating membrane is found in the following organisms:

  • In some parasitic flagellates such as trypanosomes and trichomonads, undulating membrane is a fin-like extension usually associated with the flagellum. The presence of undulating membrane enhances motility of the parasite in a viscous fluid, such as blood. (Minchin 2003)
  • In some ciliates such as Tetrahymena, an undulating membrane is made up of a row of fused cilia and assumed to aid in capturing food. (Minchin 2003)
  • In spermatozoon of some animals such as some sarcopterygian fish and toads (Bufo marinus). ( Birkhead and others 2009)

Also called:

  • undulatory membrane


  • Birkhead TR, Hosken, DJ, Pitnick, S. 2009. Sperm biology an evolutionary perspective. Amsterdam: Elsevier/Academic Press, p.112-113.
  • Minchin E. 2003. Protozoa microbiology & guide to microscopic identification. Palm Springs (CA): Wexford College Press, p. 55-56.

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biology help!!!!!!!!!!

... He accomplished this by poking his tail out of the house and doing his undulating dance without a care for what the neighbors thought! ER and Nuc ... who got too big for his britches and decided to infold his plasma membrane. This happened over thousands of generations. Slowly, but surely, ...

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by takuy12345
Thu Jun 23, 2011 3:04 pm
Forum: General Discussion
Topic: biology help!!!!!!!!!!
Replies: 1
Views: 8101

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