The colon is about six feet long and is the part of the body's digestive system that moves waste material from the small intestine to the rectum. The colon is comprised of four distinct layers: the mucosa, the submucosa, the muscularis externa (two thick bands of muscle), and the serosa.
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 Overview |  Mucosa |  Submucosa |  Circular Muscle |
 Longitudinal Muscle |  Serosa |
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