HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Colon. Light micrograph of a section through the large intestine, or colon. The lumen (interior) of the colon is at top. The colon is lined with intestinal villi containing crypts of Lieberkuhn, elongated pockets that lie in the vascular submucosa (dark purple). These glands contain two types of cells: goblet cells, which secrete a lubricant into the colon which aids the movement of faeces; and absorptive columnar epithelial cells, which absorb water from the faeces. Beneath the submucosa is smooth muscle (grey). Magnification: x 28 when printed at 10 centimetres wide.
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