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Related Experiment Video

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Modeling Ascending Vaginal Infection, Preterm Birth, and Neonatal Morbidity in Mice
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[Lucy's parturition, a way towards extinction?].

G Chene1, A-S Tardieu, B Trombert

  • 1Département de gynécologie-obstétrique et médecine de la reproduction, 2, avenue Albert-Raimond, 42023 Saint-Étienne, France. chenegautier@yahoo.fr

Gynecologie, Obstetrique & Fertilite
|August 31, 2013
PubMed
Summary
This summary is machine-generated.

Australopithecine pelvic morphology, characterized by a platypelloid shape, suggests childbirth was as challenging as in modern humans. This contrasts with apes, indicating complex obstetrical mechanisms in early hominines.

Keywords:
AnthropologieAnthropologyBassinEvolutionObstetricsObstétriquePelvisÉvolution

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Area of Science:

  • Paleoanthropology
  • Primate Anatomy
  • Evolutionary Biology

Background:

  • Understanding hominine evolution requires examining key anatomical features like the pelvis.
  • Pelvic structure is crucial for bipedal locomotion and birth canal dimensions.

Purpose of the Study:

  • To compare pelvic morphology between australopithecines, modern humans, and non-hominid primates.
  • To infer the obstetrical mechanisms and birth process in australopithecines.

Main Methods:

  • Reconstruction and comparative morphometric analysis of bony pelves from fossil australopithecines (Australopithecus afarensis, A. africanus), modern humans, and anthropoid primates (gorillas, chimpanzees, orangutans).
  • Utilized 16 pelvimetric measurements and logarithmic factorial analysis.

Main Results:

  • Australopithecine pelves exhibited lower anteroposterior (AP) and transverse (TRV) diameters and a platypelloid shape compared to other species.
  • Pelvic morphology of australopithecines was distinct from both humans and non-hominid primates, though closer to humans.
  • The AP/TRV index was lowest in australopithecines across pelvic inlet, midpelvis, and outlet.

Conclusions:

  • The platypelloid pelvic shape in australopithecines implies birth mechanisms were as difficult as in modern Homo sapiens.
  • Obstetrical mechanics in australopithecines were likely more complex than in apes.
  • Natural birth without cesarean intervention was probably feasible in australopithecines, potentially via an asynclitic transverse (TRV) orientation.