Study seems to have uncovered why vaginal birth is so difficult in men


It makes sense within the scientific community that human physiology is unique and different from all other primates. However, this ends up making the birth of our species much more difficult. To find the causes, the researchers explored the biomechanical modeling technique, revealing some important facts.

Scientists say the shape of the human birth canal is narrow and curved at the entrance, and the contractions babies feel at birth must rotate babies’ large brains, along with their broad shoulders, nearly 90 degrees. to adapt to their pelvis. If the baby gets stuck, the life of the baby and the mother can be in danger, and sadly, this happens in about 6% of all births worldwide.

Imagem: Stansfield et al. , BMC Biology, 2021

Even today, many of the fundamental elements of a human pregnancy remain a mystery, and traditionally the human pelvis has to be shaped to help a person walk. However, in terms of evolution, being a bipedal animal does not favor delivery time. The researchers explained that if the uterine entrance to the birth canal is oval and deep, the baby can slide straight out, without having to make very complex movements, like other primates do.

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However, in humans, the pelvis will need to tilt more, which will eventually lead to a deeper curvature of the lower back, compromising the stability and health of the spine. Therefore, it is likely that this is the reason why the birth canal developed and took this shape. In the case of chimpanzees, the chicks only have to turn their heads a little to exit, while the babies have to move about 90 degrees.

Photo: reproduction / freestockcenter / Freepik

Even after this movement, the baby will not have a straight exit and will have to rotate again to exit the shoulders from the birth canal, as they are wider than the head. Scientists’ research therefore indicates that the area has this shape to better support the pelvic floor, helping the bones to support the abdominal organs. If the lower birth canal has a wider outlet, the stability of the pelvic floor will be improved, but childbirth will be more dangerous.

According to evolutionary studies, the birth canals of Neanderthals were similar to those of chimpanzees, indicating that this twist is relatively recent and unique to humans. Since Neanderthals also stood and walked on both feet, just like the rest of us, it becomes interesting for scientists to understand the cause of the pelvic pelvis. sane man come out.

The study was published in the scientific journal BMC Biology.

Source: Scientific alert

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