Humans still maintain parts of their bodies called "evolutionary remnants." They are those who have no use for functions that we develop in modern life, but which, however, do not always occur.
All fulfill certain functions and in many vital cases for our ancestors. Although not everyone maintains it, these are some of the most common, according to Dorsa Amir, an evolutionary anthropologist at Boston College, in the United States, to the Business Insider portal.
The first and perhaps most famous is the appendix. Scientific research shows that this organ helps digestion of plants with excess cellulose which is part of our ancestral food.
When our diet becomes more varied, appendicitis loses its function, Amir noted. Of course, he points out that there is an increasing number of studies showing that appendicitis can continue to play several roles now as a storehouse of bacteria in our intestines.
The second is Palmar Largo. Not everyone has it, but it is a muscle that moves from the wrist to the elbow. If you extend your arms with your palms up and unite your thumbs with your fingers forming a cone, you may see a very thin, straight bulge that stretches across your forearm. It's not a tendon, it's softer.
10% of humans have lost it, scientists say, but before it was used to help our ancestors exert the strength needed to climb trees.
At number three, the youngest teeth are. Its function is to grind hard meat and raw cereal given by our ancestors. Now, our diet is much lighter and we don't need to chew it intensely. Our jaws are also not as strong as millions of years ago.
Not everyone gets everything, sometimes not at all, but if they do it they usually cause a lot of pain and sometimes they are even recommended to be removed.
The number four is the pili arrector muscle. We used to have more hair in our body than now. The pili arrector muscle, which is connected to the hair follicle, helps to ruffle hair so that it appears bigger in risk or threat situations.
Today we don't need this, but it can be observed that many mammals with hair keep it, for example cats.
In the fifth place is the embryo's tail. Now between five and eight weeks after fertilization occurs, the fetus begins to develop a pre-birth tail that disappears to form what we now know as the tailbone.
This tail is responsible for moving and maintaining balance. When we learned to stand, we lost it because it was no longer useful.
In the sixth place are the muscles in the ear. They are responsible for removing visible parts of the ear, but very few people have control over them, explained the anthropologist. Some mammals use it to detect prey or predators and it is believed that humans use it for the same thing.
Pyramidal muscles are located at number seven. Located in the lower abdomen and has a triangular shape. There are people who don't have and some have two.
They only function to move the dawn line (which moves from the lower abdomen to the chest, across the belly button longitudinally). At present it is useless but it is believed that in the past, when we walked on four legs, it facilitated mobility and rotation of the abdominal muscles.
In the eighth place are male nipples. Nipples fulfill, biologically, a special function: to facilitate breastfeeding. But because women are breastfeeding, why are men born with them? The reason is that the embryo's body, both women and men, begins to develop in the same way.
When testosterone, which is responsible for the formation of male sexual organs, starts acting, the nipple has developed.
And finally the third eyelid. This is a fold that is located in the inner corner of the eye and looks like a membrane that some animals like birds, reptiles and even some mammals must protect their eyes. They are used to keep them moist and free of debris, but in the case of humans there are hardly any leftovers and besides, we don't have power over them.