Parsons, Thomas S. Ramsay Wright Zoological Laboratories, University of Toronto, Ontario, Canada.
Last reviewed:October 2019
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A narrow, elongated tube closed at one end, extending from the cecum (a blind pocket off the first part of the large intestine). The appendix (see illustration), also known as the vermiform appendix, is found in only a few mammals. The size and detailed structure of the appendix vary markedly, depending on the species and the age of the individual. Most reptiles, birds, and mammals have either a single cecum or paired ceca at the anterior end of the large intestine, but it is quite rare that there is a thinner cecal projection or true appendix. See also: Intestine
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