Amphibians muscle… Evolutionary record hidden in the fetus

Human fetal limbs and limbs develop muscles like lizards, but they disappear before they are born. Of course, there are cases where the unselected path among the evolutionary steps of living things remains a part of the body that has been degenerated. When it comes to humans, things like the appendix, wisdom teeth, and tailbone.

However, sometimes they disappear before they are born. According to a new study published in the journal Development, a strange muscle was developing in the limbs as a result of three-dimensional imaging of fetal growth. The muscle called’Dorsometacarpales’ is usually only found in amphibians, but it also appears in the legs of human fetuses.

The hands and feet of the fetus at the 7th week are said to have developed 30 kinds of degenerated muscles, including these muscles, but by the 13th week, one-third of them have already disappeared or are included in other muscles, so there is no trace. It is said that the muscles that were lost 2.5 billion years ago in the evolutionary history still appear as atypical genetics and disappear before they are born.

Rui Diogo, an evolutionary biologist at Howard University who published the study, said that it was interesting to observe muscles that no one has paid attention to until now in fetal development studies. It is said that this is a fairly slow step for an example of atypical genetics.

An example of this deterioration is a valuable milestone in how it has evolved over time. Even now, when humans don’t need the tail, the blueprint for the tail still remains in our genes. In the rare case of mutations and developmental abnormalities, it is potentially possible for humans to raise their tails again.

There is also the possibility of being born with the degenerate muscles shown in this study. Of course, the research team says that even if you have these special muscles, it shouldn’t be a big problem. The development of the fetus, where the evolution of living things is noticeable, shows the footsteps of evolution. Related information can be found here .