We are the sum of our past.The human body is a living testimony of the evolutionary changes that it has undergone over thousands of years of adaptation and improvement, and we still have some organs, muscles and bones that are traces and irrefutable evidence of evolution.
They are called vestigial organs or structures , and our wonderful human body has at least a hundred.Here we offer you just 8, so you can give yourself a idea of those things that form our body structure and which, in some cases, we could do without.
8 evolutionary changes that you can find in your own body
1.The male nipple
Alexander with Humboldt reported certain cases in South America in which men would have breastfed their children, in cases in which the woman had died or had no milk.It is very, very strange that this happens, and surely they have been cases in which survival was seriously compromised.Normally, male nipples are nothing but a facade, because your breast function does not exist .
The The only known case of a male spontaneously having the ability to breastfeed is the fruit bat, the dyacopterus spadiceus .
2.The third eyelid
The so-called third eyelid is an almost always translucent membrane that birds and reptiles have, and that allows them to clean the eye and lubricate it without losing vision.
Among the evolutionary changes we can see in our own eyes is the plica semilunaris , that experts create a vestige of the third eyelid.
3.The coccyx
Well yes, the coccyx is the vestige of a tail...and we did not lose it long ago, in fact between weeks 14 and 22 of human gestation you can see a tail that then it is reabsorbed.
Although they are extremely rare, there are people who keep it after birth.
4.The wisdom teeth
They are called that because they start dating after all the dentures Fixed or bone sprout definitely.Normally, the process begins at age 18.
There are already people who do not have them, but before they were necessary to chew the hard and raw meat of hunting; We needed strong jaws and many equally strong teeth.Today they are a vestige of these evolutionary changes and many times we have to remove them surgically, since they are more discomfort than benefits.
5.The muscles of the ears
You undoubtedly read our article about the caracal, a beautiful cat that moves its ears at will and everywhere.Primates generally have them, and they are very useful for locating sounds or threats.
We also have those muscles that allow us to move them but they are currently atrophied, although there are many people who can voluntarily move the pavilion of the ear.
6.The appendix
Many of us have asked ourselves what the hell is that little thing that we have at the end of the intestine, apart from causing appendicitis.
Before, long before, far behind, the appendix helped digest ric plants ace in cellulose, such as cereals; When we learned to handle the fire, approximately 790,000 years ago, cooking allowed easier digestion of these foods, but the appendix remained.
There are researchers who point to a certain role in the body's defenses, but who It has no appendix does not show any evidence of less resistance to diseases.
7.The palmar reflex
It is not an organ itself, but one of the most important and interesting evolutionary changes of our species.
In fact it is one of the tests that are done to the children just born, to place a finger in his palm; Babies tend to close it and grab the finger with enough force to lift their own weight, a skill that is lost to the fifth week of birth.
This behavior could be due to the need to hold on tightly to the maternal back, when the mother moved him from tree to tree.
8.Goosebumps
Feeling cold or fear can literally give you goosebumps; if we still had a lot, a lot of hair, this reflex would be extremely useful, because erect hairs could catch more air between them and isolate and protect better.
And if fear were the cause, the "creeps ”Would make you look bigger to scare potential predators.
We've lost almost all of our body hair, and goosebumps are just a trace of our hairy past.
There are many other vestiges of evolutionary changes, such as tonsils or sinuses, that have remained in our body.In the case of tonsils they still maintain, in 90% of cases, their protective and barrier function against bacteria and viruses, although many times it is they need to be removed because, on the contrary, they have become the focus of infections.
There are experts who say we will eventually lose the small toe because it will not be necessary ario...What do you think? Read also Is the human face unique?
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