what are payer's patches?
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Peyer's patches are clusters of subepithelial, lymphoid follicles found in the intestine. They are oval or rectangular in shape and found on the antimesentric wall of the intestine. They are more prominent in ileum and are characterized by specialized epithelial cells called M cells.
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The gut-associated lymphoid tissue (GALT) consists of isolated or aggregated lymphoid follicles forming Peyer's patches (PPs). By their ability to transport luminal antigens and bacteria, PPs can be considered as the immune sensors of the intestine.
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