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Function. Because the lumen of the gastrointestinal tract is exposed to the external environment, much of it is populated with potentially pathogenic microorganisms. Peyer's patches thus establish their importance in the immune surveillance of the intestinal lumen and in facilitating the generation of the immune response within the mucosa.
There are 30 to 40 Peyer's patches, all containing lymphoid tissue that is high in white blood cells. Other lymphoid tissue, known as gut-associated lymphoid tissue (GALT), can be found in other areas of the intestines. When people are young, these areas are highly visible and easy to distinguish.