Mapping the Gut Immune System: Where Peyer’s Patches Actually Reside

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Peyer's patches are not confined to a single anatomical compartment. Rather than existing as an isolated curiosity of the terminal ileum, they form the dense end of an immunological gradient spanning the human small intestine. Their presence across the distal jejunum and density throughout the ileum mirror the microbial load of the gut, providing continuous antigen sampling and driving mucosal immune responses. Moving past rigid textbook classifications allows researchers and clinicians to better understand inflammatory bowel diseases, track enteric infections, and design targeted oral therapies that engage the gut's immune architecture where it actually lives.