We have six body parts that we no longer use. Why are they needed?
Wiggling ears, and a third eyelid — millions of years ago our ancestors found a use for them. Despite the fact that some human bodies have ceased to function, people still are born and live with the “evolutionary remnants”.
Some distinctive features of organisms persist for many generations even after the appropriate authority has ceased to perform the allotted function. These evolutionary remnants, or vestigial features, there are people.
“Your body is, in fact, the natural history Museum!” — wrote in “Twitter” evolutionary anthropologist Dorsa Amir.
So why are these properties or organs are not lost, despite the fact that they, apparently, have lost their function? Because evolution is a gradual process.
Sometimes they are not exerting sufficiently hard pressure of natural selection, so they are passed from generation to generation. In some cases, vestigial organs developing new functions. This process is called acceptatie.
How do we know what these bodies or body parts were originally intended?
We can only guess what is the main function of these bodies. We can find out, for example, whether they are important for survival, or to see if they are the closest to us primates and mammals, and if so, how they function.Dorsa Amir
Here are six of these rudiments.
1. Palmaris longus muscle at the wrist
Do an experiment: put your hand palm up on a flat surface and connect the thumb with the little finger.
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See the bump that appeared on your wrist? This is the Palmaris longus, long Palmar muscle.
Don’t worry, if I see her. Approximately 18% of people no, and it’s absolutely no effect. A perfect example of an evolutionary vestige.
This muscle is present in living in the woods or in the trees primates, such as orangutans, but not all primates that live in other territories.
“This suggests that the muscle needed to climb trees,” says Dorsa. In our day the practical application of this muscle found surgeons.