Dr. Richard Kessel

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Cross-section of the mammal colon or large intestine. From the lumen outward are the mucosa, submucosa, muscularis externa, and the thin outer serosa. The highly folded layers are typical of an empty organ. Note the several simple tubular intestinal glands at the tips of the folds. The muscularis externa is divided into an inner circular and an outer longitudinal layer of smooth muscle. SEM X110. **On Page Credit Required**