Simulations of Australopithecus hominins’ anatomy suggest that when they gave birth, they may have exerted tremendous pressure on their pelvic floors, putting them at risk of tearing
Childbirth was difficult and dangerous for our ape-like ancestors, much as it is for women today. A new study of the pelvises of, a midwife at Aix-Marseille University in France. “If they had lots of deliveries, probably they would have a greater risk of pelvic floor disorder.
”For modern humans, vaginal childbirth requires a lot of force, as a large-headed baby is forced through a relatively narrow pelvis. One region that is prone to damage is the pelvic floor, a sheet of muscles that links the left and right halves of the pelvis. Many women tear their pelvic floor during labour, and it’s been estimated that, which lived in Africa between about 2 million and 4 million years ago. These early hominins walked upright but were also still adapted to spend time in trees, and may have made and used stone tools. They may have been the ancestors ofbirth canal was oval: it was wide from left to right, but narrow from front to back. Non-human primates like chimpanzees have the opposite set-up, whereas the modern human birth canal is more circular.. To model the pelvic floor muscles, the researchers took an MRI scan of a pregnant woman, extracted the three-dimensional image of the pelvic floor, and morphed it to fit thepelvises. Then they simulated a baby being pushed through the pelvises, and estimated how much force would be exerted on the pelvic floor.pelvic floor experienced forces of 4.9 to 10.7 megapascals, similar to the 5.3 to 10.5 MPa exerted on the human pelvic floor during labour.Despite that, Betti is cautious about the results. She says we don’t know if the pelvic floor muscles ofdiffered from ours, which could have made them more or less resilient to tearing. Also, as a check, the team modelled two modern human births, and in one case the baby did not rotate in the birth canal as they do in real life. This indicates that the simulations are missing key factors, she says.pelvises – all from different species – is a small dataset. There are no known pelvises from earlier hominin species. New Scientist regularly reports on the many amazing sites worldwide, that have changed the way we think about the dawn of species and civilisations. Why not visit them yourself?
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