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Abstract
The appendix is a narrow, worm-shaped pouch of tissue, usually less than 1 in. wide and 3 to 4 in. long, that extends from the large intestine. Its purpose is not known, but some researchers think it may help trigger the immune system to fight disease. Getting along without one is no problem—which is a good thing, since the most common reason for abdominal surgery is removal of an inflamed appendix.