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Related Concept Videos

Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
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Chicken Recombinant Limbs Assay to Understand Morphogenesis, Patterning, and Early Steps in Cell Differentiation
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Morphological integration in mammalian limb proportions: dissociation between function and development.

Manuela Schmidt1, Martin S Fischer

  • 1Institut für Spezielle Zoologie und Evolutionsbiologie, Friedrich Schiller Universität Jena, Erbertstrasse 1, 07743 Jena, Germany. schmidt.manuela@uni-jena.de

Evolution; International Journal of Organic Evolution
|December 18, 2008
PubMed
Summary
This summary is machine-generated.

Mammalian limb evolution shows distinct forelimb and hindlimb proportion patterns. Hindlimb proportions align with biomechanical stability, while forelimb variations suggest diverse adaptations and developmental constraints.

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Area of Science:

  • Evolutionary biology
  • Comparative anatomy
  • Biomechanics

Background:

  • Mammalian limb evolution involved a shift from sprawling to parasagittal postures.
  • This reorganization created a dissociation between serially homologous and functionally analogous limb elements.
  • The scapula became a proximal forelimb element analogous to the femur, and the tarsus/metatarsus formed a hindlimb element analogous to the forearm.

Purpose of the Study:

  • To investigate if mammalian intralimb proportions follow biomechanical principles for postural stability.
  • To test the relationship between morphological covariation in serially homologous and functionally analogous limb elements.
  • To analyze limb proportions across 189 mammalian species.

Main Methods:

  • Correlation analysis was used to examine morphological covariation.
  • Intralimb proportions of 189 mammalian species were measured and compared.
  • Statistical analysis was performed to identify relationships between limb element proportions.

Main Results:

  • A significant relationship was found between the proportions of the first and third limb elements.
  • The middle limb element showed less involvement in intralimb proportion changes.
  • Hindlimb proportions were remarkably uniform across species and supported biomechanical predictions for stability.

Conclusions:

  • Mammalian hindlimb proportions are conserved and optimized for postural stability.
  • Forelimb proportions exhibit greater variability, likely due to diverse adaptations and shared developmental pathways with hindlimbs.
  • Understanding these proportion patterns provides insights into evolutionary constraints and functional requirements of mammalian locomotion.