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Dissection, MicroCT Scanning and Morphometric Analyses of the Baculum
Published on: March 19, 2017
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Allometry and Sexual Dimorphism in the Human Pelvis
Barbara Fischer1,2, Philipp Mitteroecker2
1Konrad Lorenz Institute for Evolution and Cognition Research, Martinstrasse 12, Klosterneuburg, 3400, Austria.
Anatomical Record (Hoboken, N.J. : 2007)
|March 16, 2017
Summary
Human pelvic shape differences between sexes are partly due to stature (allometry) and partly due to other factors. Birth-related pelvic dimensions show mainly non-allometric sexual dimorphism, likely from puberty hormones.
Area of Science:
- Human anatomy
- Evolutionary biology
- Anthropometry
Background:
- Sexual dimorphism in the human pelvis is influenced by locomotion and childbirth demands.
- Stature differences between sexes can contribute to pelvic shape variations through allometry.
Purpose of the Study:
- To disentangle and quantify the allometric and non-allometric components of pelvic sexual dimorphism.
- To investigate the origins of sex differences in pelvic dimensions relevant to childbirth.
Main Methods:
- Geometric morphometric analysis of 3D landmarks from 99 adult individuals.
- Quantification of allometric (stature-related) and non-allometric components of pelvic shape differences.
Main Results:
- Pelvis size was similar between sexes, but shape differences were significant and sex-specific.
- Stature was similarly associated with pelvis size and shape in both males and females.
- Pelvic height-to-width ratio and iliac blade orientation were largely allometric; subpubic angle and acetabula dimensions were largely non-allometric.
Conclusions:
- Overall pelvic proportions show significant sexual dimorphism, partly explained by stature.
- Sexual dimorphism in birth-relevant pelvic dimensions is primarily non-allometric, suggesting hormonal mediation during puberty.
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