The vermiform appendix is not a vestigial organ and has immune functions
Modern anatomical and immunological research shows that the vermiform appendix is not a useless vestigial structure, but rather an organ involved in immune function and the maintenance of the gut microbiome.
The claim states that the appendix is not vestigial and possesses immune functions. Papers 2, 3, and 9 all review the immunological role of the appendix (such as housing lymphoid tissue and participating in B-cell maturation and gut microbiome maintenance) and reject its historical characterization as a purely redundant organ. The retrieved literature clearly supports the claim.
Agrawal M, Allin KH, Mehandru S, Faith J, Jess T, Colombel JF. The appendix and ulcerative colitis - an unsolved connection.. 2023. https://doi.org/10.1038/s41575-023-00774-3
Discusses the immunological function of the appendix and its association with mucosal immunity and ulcerative colitis.
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Constantin M, Petrescu L, Mătanie C, Vrancianu CO, Niculescu AG, Andronic O, Bolocan A. The Vermiform Appendix and Its Pathologies.. 2023. https://doi.org/10.3390/cancers15153872
Highlights the appendix's role in immune function, specifically in the maturation of B lymphocytes and immunoglobulin A production, as well as storing beneficial bacteria.
L. Vitetta. The vermiform cecal appendix, expendable or essential? A narrative review. 2022. https://doi.org/10.1097/MOG.0000000000000881
Notes that the appendix has a high concentration of lymphoid tissue and serves as a biofilm safe-house for the microbiome, contradicting the notion that it is merely a redundant vestige.
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