Dictionary of Human Evolution and Biology

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Vestigial Trait, Character Or Feature

Any feature that is imperfect or poorly developed. Used especially of features that have become reduced or diminished during the course of evolution or individual maturation and aging. Examples of vestigial tissues in humans include body hair, cervical rib, female vas deferens, male nipples, male uterus, palmaris muscle, plantaris muscle, polymastia, pyramidalis muscle, subclavius muscle, thirteenth rib, vermiform appendix, vomeronasal organ, and wisdom teeth.

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