Home / Science / Humans are STILL evolving, say experts who have discovered that an artery lost at birth is still present

Humans are STILL evolving, say experts who have discovered that an artery lost at birth is still present



A new study suggests that humans are still evolving and “at a faster rate than at any time in the past 250 years.”

Scientists have found an increase in the prevalence of an artery in the forearm, which typically disappears about eight weeks after birth, since the late 19th century.

Called the median artery, when the structure begins to disappear, two more arteries form in its place, but there has been an increase in cases with all three.

Prevalence began around 1880 in 10% of the population, but in the 20th century, cases increased to 30%.

The team found that this vessel is currently present in 35% of people and theorize that those born in 80 years will carry a median artery.

Scientists have found an increase in the prevalence of an artery in the forearm, which typically disappears at birth, since the late 19th century. Called the median artery, when the structure begins to disappear, two more arteries form in its place, the radial and ulnar arteries ¿but there has been an increase in cases with all three

Scientists have found an increase in the prevalence of an artery in the forearm, which typically disappears at birth, since the late 19th century. Called the median artery, when the structure begins to disappear, two more arteries form in its place, the radial and ulnar arteries – but there has been an increase in cases with all three

The discovery was made by experts from Flinders University and the University of Adelaide.

The median artery is an important vessel in the embryogenic circulation, which carries blood through the forearm and hand.

After birth, the artery retracts and is replaced by the radial and ulnar arteries.

Dr Teghan Lucas of Flinders University said, “Since the 18th century, anatomists have studied the prevalence of this artery in adults and our study shows that it is clearly increasing.”

Prevalence began around 1880 in 10% of the population, but in the 20th century, cases increased to 30%. The team found that this vessel is currently present in 35% of people and theorize that those born in 80 years will carry a median artery

Prevalence began around 1880 in 10% of the population, but in the 20th century, cases increased to 30%. The team found that this ship is currently present in 35% of people and theorize that those born in 80 years will carry a median artery

“The prevalence was around 10% in people born in the mid-1880s compared to 30% in those born in the late 20th century, so that’s a significant increase in a fairly short period of time when it comes to evolution. . “

“This increase could be the result of mutations in genes involved in median artery development or health problems in mothers during pregnancy, or indeed both.”

“If this trend continues, most people will have the median artery in the forearm by 2100.”

The team suggests the presence of the median artery benefits because it increases overall blood supply and can be used as a substitute in surgical procedures elsewhere in the human body.

And they refer to this as “micro evolution” in humans.

Senior author, Professor Maciej Henneberg, of the University of Adelaide, said: “ the median artery is a perfect example of how we are still evolving because more recently born people have a higher prevalence of this artery than to humans of previous generations.

“We collected all data published in the anatomical literature and continued to dissect donated cadavers for studies in Adelaide.

“We have found that around one third of Australians have the median artery in the forearm and all will have it by the end of the century if this process continues.”

The median artery is not the only indicator that humans are still evolving, as there are cases of individuals born without wisdom teeth.

The teams say this is the result of human faces getting smaller, which has less space for these teeth.

The study also identified multiple cases of spina bifida occulta, an opening in the sacral canal which is the bone at the base of the spine.

Dr Lucas added: ‘We are also finding that many people have extra joints in their feet – abnormal connections between two or more bones.

The median artery is not the only indicator that humans are still evolving, as there are cases of individuals born without wisdom teeth. The teams say this is the result of human faces getting smaller, which has less space for these teeth

The median artery is not the only indicator that humans are still evolving, as there are cases of individuals born without wisdom teeth. The teams say this is the result of human faces getting smaller, which has less space for these teeth

“There are also others who are born with a small bone behind the knee called fabella. None of these things can harm you.

At the turn of the millennium, the widespread belief in human evolution stopped before the reign of the pharaohs.

But recent research has suggested that genetic change occurred 100 times faster in the past 5,000 years than in any other period.

The team isn’t the first to dive into the median artery, experts have been investigating these cases for years.

In 2013, researchers from the Tata Institute in India found more cases specifically in the left arm during dissections of human adults.

They theorize that the presence of the artery may eventually cause an individual to develop carpal tunnel syndrome.

However, it can be thought of as an “emergency vessel” to deliver blood to the hand in case the radial and ulnar arteries are damaged.

And it could also be used for grafting purposes in other parts of the body, as suggested in a recent study.

HOW HAS THE SHAPE OF OUR BRAIN HAPPENED OVER TIME?

New research suggests that major evolutionary changes in the shape of our brains occurred 100,000-35,000 years ago. Stock image

New research suggests that major evolutionary changes in the shape of our brains occurred 100,000-35,000 years ago. Stock image

Researchers from the German Max Planck Institute for Evolutionary Anthropology have found that major evolutionary changes in the shape of our brains occurred approximately 100,000 to 35,000 years ago.

Homo sapiens brain has taken on a globe-like shape that is “ rounder and less prominent ”

In contrast, the brains of our Neanderthal ancestors had a more elongated shape

The evolution of our brain shape coincided with major developments in behavior, as Homo sapiens began to:

  • Construction tools
  • Develop a working and long-term memory
  • You have self-awareness
  • Use your tongue
  • Plan your activities
  • Understand the numbers
  • Pay attention to their surroundings
  • Develop emotions

The brain began to look more like a globe due to the swelling in the parietal area and cerebellum


Source link