Why do human thumbs only have 2 burns?

The thumb has only 2 burns while the other fingers have 3 knuckles. Most of us take it for granted and never wonder why our thumbs are so different from their "brothers".

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Read the article below to find out the cause of the difference between thumb and other fingers.

Our hands have 5 fingers, including the index finger, middle finger, ring finger, and pinkie, although they have different lengths but each finger is divided into 3 different burning, only the thumb is divided into 2 burning.

According to the researchers, the reason that thumbs have only two burns is the result of human evolution, natural selection to adapt to the living environment.

As we know, humans evolved from ancient gibbons, living in deep forests, climbing and walking with their limbs. And to accommodate the sticking and climbing activities on the tree, the thumb and big toe were separated with 4 other fingers. At that time, the fingers or legs divided into 3 burners are most suitable.

After going down to the ground, the gibbon went straight to stand on the 2 back limbs, the first two were released.

In the process of evolution, two hands often have to grasp and use tools so the thumb becomes stronger, can operate independently, easy stretching, can be combined with 4 fingers Left hand. And to accommodate, the structure of the thumb is divided into 2 burning is most appropriate.

But why 2 burn but not 1 burning? If the thumb has only 1 burning, it is quite weak, not enough power to perform big movements that make people encounter many inconveniences in life.

If the thumb has up to 3 burns, it will make the combination of the thumb and fingers less flexible and redundant.

In short, the construction of a two-pronged thumb is the best choice of natural selection to help people use their most flexible hands.