SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Peyer's patches (red), coloured scanning electron micrograph (SEM). These regions of lymphoid tissue are found in the human intestine, usually in the ileum, the final section of the small intestine. Their function is to defend against infection in the intestines, where large numbers of pathogenic microbes are found. This is because the lumen of the gastrointestinal tract is effectively exposed to the external environment despite being inside the body. Peyer's patches are named after the Swiss anatomist Johann Conrad Peyer, who described them in 1677. Magnification: x65 when printed 10 centimetres wide.
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