A study published on 1 February in the journal Nature Physics, explains why the brain has this special form, near the walnut kernel.
Some associate it with nuts, others to a blank, or a plate of spaghetti. One thing is certain: the human brain and its many folds always fascinate. So much so that the scientists themselves, after locating the area of happiness, have studied its strange shape. The researcher Tuomas Tallinen and his team from the University of Jyvaskyla in Finland have discovered that the skull was actually a simple mechanical compression.
The brain, if it was fully unfolded, would cover between 1-2 square meters, yet it holds a skull which is between 1100 and 1700 cm3. To explain that it can fit into a small volume, so it is folded on itself. According to the work of Finnish scientists, these creases and folds would form from the 20th week of gestation the fetus and they développeraientjusqu'à that the child is a year and a half.
To observe this phenomenon of "folding" of the brain, the team Tuomas Tallinen built a model of a brain of human fetus, according to MRI. They applied on their replica gel and immersed brain model in a solvent which causes swelling on the surface of the organ. This way they were able to note that when the gel layers swell, mechanical compression forces are created, that is how the brain folds take shape.
Beyond the simple explanation for the shape of the brain, the study authors welcome such a discovery. Their work would make it possible to better diagnose certain neurological pathologies and improve many neurological treatments.
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