Why only 2 thumb burning?

The human hand has 5 fingers, except for the thumb, all the remaining fingers have 3 burners, only 2 thumbs are burned. However, the function of the thumb occupies half of the function of the hand, without the thumb, the whole hand will no longer be flexible. Why only 2 burn your thumb?

Explain the science of why thumb has 2 burns

According to the evolutionary theory we know, humans evolved from ancient gibbon . The life of an ancient gibbon is in the deep forest, climbing and climbing back and forth from the limbs, thumb and big toe are divided with 4 other fingers, when conducting clinging activities on trees, with hands or feet 3 burning is the most appropriate, but the effect of fingers only 2 burns is not large. Later, the ancient gibbons went to the ground to practice walking upright, the upper limbs were liberated, especially after they evolved into human beings, because the hands often had to hold tools, the thumb became very beneficial and sure . In addition to the handle grip also developed a very healthy muscle, making the thumb work in combination with 4 opposite fingers.

The image of the hand is clearly visible to see the burning of the fingers (Photo: crazyus)

To adapt to the symmetrical activity of the thumb , making the thumb can stretch, rotate, fold easily, the best structure is 2 burning. If the thumb holds 3 burners, the operation will not have 2 neat and flexible advantages. Therefore, the thumb structure is a selective result of nature , of evolution.

As a result of this evolution, the modern man's thumb has become one of the most effective fingers. According to scientific statistics, all movement movements involving fingers are almost over half needing the help of a thumb. The thumb can work independently, can work with 4 other fingers, like writing letters, holding chopsticks, holding .