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Published on: January 29, 2018
Exploring the Laws of Developmental Direction Using a Documented Skeletal Collection
Jennifer S Nelson1, Lesley Harrington1, Emily Holland2
1University of Alberta, Edmonton, Alberta, Canada.
American Journal of Biological Anthropology
|December 26, 2024
Summary
Human limb growth shows complex patterns. While the lower limb and upper limb
Area of Science:
- Human growth and development
- Biocultural anthropology
- Skeletal biology
Background:
- Human growth studies often observe greater variability in distal limb segments compared to proximal ones.
- This pattern is linked to developmental sequences, where later-developing bones are more susceptible to environmental influences.
- The laws of developmental direction posit a gradient of growth sensitivity from proximal to distal elements.
Purpose of the Study:
- To investigate limb dimension variations in children within the framework of developmental direction.
- To analyze growth patterns in a skeletal collection from a low socioeconomic status population.
Main Methods:
- Z-scores were calculated for diaphyseal lengths of six limb bones in children aged 0.09–11.75 years.
- Paired samples t-tests were used to compare mean z-score differences between limbs and between proximal and distal segments within each limb.
Main Results:
- The lower limb exhibited significantly more stunting than the upper limb (p ≤ 0.001).
- The distal upper limb segment was more stunted than its proximal counterpart (p ≤ 0.001).
- Conversely, the distal lower limb segment was less stunted than its proximal segment (p ≤ 0.001).
Conclusions:
- Findings for the lower limb versus upper limb and the upper limb's segments align with the laws of developmental direction.
- The greater stunting in the proximal lower limb segment contradicts the expected developmental gradient.
- Results highlight the intricate nature of human growth and developmental plasticity influenced by biocultural factors.
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