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The primate caecum and appendix vermiformis: a comparative study

G B Scott

    Journal of Anatomy
    |October 1, 1980
    PubMed
    Summary
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    The primate caecum and appendix evolve with species progression. The caecum shrinks relative to the colon, while the appendix develops, indicating progressive evolution rather than vestigial status.

    Area of Science:

    • Primate anatomy
    • Comparative anatomy
    • Evolutionary biology

    Background:

    • The caecum and appendix are key features of the primate digestive system.
    • Previous understanding suggested the appendix might be a vestigial organ.

    Purpose of the Study:

    • To investigate the evolutionary changes in the caecum and appendix across primate species.
    • To determine if the appendix shows signs of development or regression in primates.

    Main Methods:

    • Anatomical examination of caeca from cynomolgus and rhesus monkeys, orang-utans, and a chimpanzee.
    • Comprehensive review of existing scientific literature on primate digestive anatomy.

    Main Results:

    • A negative correlation was observed between caecum length (relative to colon length) and primate evolutionary position.

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  • The appendix vermiformis was absent in prosimians and New World monkeys.
  • Evidence of appendix development was found in Old World monkeys, with full development in anthropoid apes.

    • Conclusions:

    • The caecum's relative length decreases with increasing primate evolutionary status.
    • The appendix vermiformis demonstrates progressive development throughout primate evolution.
    • The appendix is not a vestigial organ but rather an evolving structure in primates.