Have you ever noticed a slightly raised band on your wrist when you touch your little finger with your thumb? This seemingly insignificant detail reveals a fascinating link to our evolutionary past. Discover why some people retain this vestige, while others lack it.
Traces of evolution in our bodies: Clues buried in our muscles and tendons
Human evolution has left astonishing traces in our bodies. Take the palmaris longus, an ancestral muscle once essential for arboreal primates. This muscle allowed them to move nimbly from branch to branch. Today, it has become useless for modern humans, and its tendon is tending to disappear in a portion of the population.
A simple test to reveal your evolutionary past
To find out if you still have this tendon, try this test:
continued on the next pagePlace your forearm on a table, palm up.
Touch your little finger with your thumb while slightly lifting your hand.
If a band appears in the center of your wrist, you have inherited this ancient tendon. If nothing appears, your body is reflecting an ongoing adaptation.
Why are we losing certain traits?
A legacy from arboreal primates.
Our ancestors, like lemurs and some monkeys, used this muscle to climb and move through the trees. Over time, humans and terrestrial primates, like gorillas, abandoned this unnecessary function. Today, about 10 to 15% of humans no longer have this tendon, marking a turning point in our evolution.
A body that adapts to the modern lifestyle.
Like the palmaris Longus, other vestigial characteristics testify to our adaptation:
Goosebumps, once used to retain heat or intimidate predators, are now unnecessary.
Wisdom teeth, essential for our prehistoric ancestors, are becoming increasingly rare in younger generations.
