MANFRED KAGE / SCIENCE PHOTO LIBRARY MANFRED KAGE / SCIENCE PHOTO LIBRARY
Large intestine. Light micrograph of a section through the wall of the human large intestine. The outermost layer, closest to the lumen (white) is the folded mucosa. This layer consists of closely packed tubular glands (long, rounded). These glands absorb water from passing food residues and secrete a lubricating mucus. Directly below the mucosa is a thin muscle layer, the muscularis mucosae (pink line). To the inside of the muscu- laris mucosae is the loose layer of connective tissue, the submucosa, containing blood vessels (round). At bottom (purple blocks) is the circular muscle layer involved in the peristaltic movement. Magnification: x20 at 6x7cm size.
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