Peyer’s Patches

Peyer’s patches (or aggregated lymphoid nodules) are organized lymphoid nodules, named after the 17th-century Swiss anatomist Johann Conrad Peyer. They are aggregations of lymphoid tissue that are usually found in the lowest portion of the small intestine, the ileum, in humans; as such, they differentiate the ileum from the duodenumand jejunum. (From Wikipedia)

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