Upright Walking: The Evolutionary Secret
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Human Pelvic Evolution: Key Findings
This text details research into the unique evolution of the human pelvis,focusing on how it enabled bipedalism (walking on two legs) and impacted other aspects of human life.
1. unique Bone Hardening Process
Typical Bone Hardening: Most mammals’ bones harden from the middle outwards.
Human Bone Hardening: Humans exhibit a different pattern: hardening starts near the sacrum (back) and spreads outwards, leaving the inner portion as cartilage for approximately 16 weeks.
Significance: This delayed hardening allows for the maintenance of pelvic shape while muscles and ligaments attach,and involves a 90-degree rotation in advancement.
2. Genes involved in Pelvic Evolution
Researchers identified three key genes with important roles:
SOX9: Mutations can lead to campomelic dysplasia (narrow pelvis).
PTH1R: affects bone growth signals and regulates the rotation of growth plates.
Runx2: Controls when and where bone cells form, particularly during hip hardening.
Combined Effect: The interplay of these genes creates a two-stage process: widening followed by delayed hardening, crucial for a pelvis supporting bipedalism.
3. Impact of Pelvic Evolution
Walking Upright: Wider ilia (hip bones) position gluteus muscles for better body stabilization during single-leg stance.
childbirth: Pelvic shape evolution balances the needs of efficient running with the requirements for childbirth, impacting the birth canal’s form.
Hip stability: Ligaments and muscles (iliofemorale and rectus femoris) attached to the ilium contribute to hip stability when standing on one leg.
4. Evolutionary Timeline
Early Divergence: The unique human pelvic development pattern emerged after the separation of human ancestors from African monkeys.
Consistent Pattern: all hominid fossils show this distinct pelvic growth pattern,differing from earlier primates.
Study Sample: The research involved 128 human embryonic/fetal samples and nearly two dozen primate samples.
Related articles (from the text):
This gorilla can walk upright like humans, what is the cause?
Since when did humans go on two legs?
Human ancestors walked with two legs 7 million years ago
[Link to another article – incomplete URL provided in the original text]
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