The Simple Wrist Test That Reveals an Evolutionary Secret
Hold your arm out in front of you with your palm facing upward.
Now touch your thumb to your little finger and gently flex your wrist.
Do you see a thin cord-like tendon appear in the center of your wrist?
If you do, you’re looking at a structure called the palmaris longus tendon.
If you don’t see it, don’t worry. You’re not missing anything important.
In fact, approximately 10-15% of people are born without this tendon in one or both arms, and most never realize it.
What makes the palmaris longus so fascinating isn’t what it does today-it’s what it reveals about human evolution, anatomy, and the remarkable variations that exist within the human body.
What Is the Palmaris Longus?
The palmaris longus is a slender muscle located in the forearm.
It begins near the elbow and extends down toward the wrist, where its long tendon becomes visible in some individuals.
Where It Is Located
The tendon runs down the middle of the inner wrist, between other tendons that control hand and finger movements.
When the correct movement is performed, it often appears as a narrow raised cord beneath the skin.
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