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What About Human Brain Folds

What About Human Brain Folds

What About Human Brain Folds

It’s All in the Shape

Ever wonder why our brain’s outer layer is shaped the way it is? Why isn’t it just a somewhat flat surface like the rest of our organs? Well, it turns out that the folded, ruffled shape, like most things in biology, isn’t some fluke or chance happening. It’s definitely a case of function over form. The folds are probably what most people notice first when they look at the brain. For some, it may be a little off-putting and for others intriguing, but there is no doubt in its value.

To understand the folds we need to revisit the Cortex, the outer layer of the brain. That’s where most of the actual ‘thinking’ takes place in our brains. The cortex is only on the surface and only about 3.4mm thick. So to maximize the amount of surface area in a relatively fixed space, we’ve evolved human brains whose surface is folded.

In fact, if we unfolded the cortex of our brains it would stretch out to 2.5 square feet or 0.23 square meters.

Close up of Folds

It’s the same principle that’s involved in making machines or car radiators. If you look through them you’ll notice that many of them have fins that go up and down like waves. This means that more material is exposed to the cooling air that passes over them. The goal of both the wavy fins of radiators and our brain folds are the same, to increase the available surface area.

Human brain folds are a highly evolved trait. Only mammals have evolved this ability and amongst them only cats, dogs, monkeys, dolphins, and humans. Other animals and mammals like rats still have their ‘primitive’ flat, unfolded brains.

The folds in the brain of course have technical names. The higher ridges are called Gyri or Gyrus (singular). The lower ‘valleys’ are called Sulci or Sulcus (singular).

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