Do You Have This Extra Tendon in Your Wrist? Here’s What It Means

Have you ever tried touching your pinky finger to your thumb and noticed a prominent tendon popping up on your wrist? Or maybe you tried and saw nothing at all. This small test can actually reveal an interesting fact about human evolution and your own unique anatomy!

The Mystery of the Palmaris Longus Tendon

The tendon that may or may not appear when you perform this movement is called the palmaris longus tendon. It is connected to the palmaris longus muscle, a vestigial structure that was once essential for climbing and gripping in our primate ancestors. However, through evolution and changes in human needs, this muscle has become unnecessary for most modern functions.

What If You Don’t Have It?

Surprisingly, around 10-15% of people lack this tendon in one or both arms. This is completely normal and does not affect grip strength or hand function in any way. Those without the tendon can still perform everyday tasks just as efficiently as those who have it.

Does It Have Any Function?

Although the palmaris longus muscle no longer plays a crucial role in our daily lives, it is often used in medical procedures. Since it is non-essential, surgeons sometimes harvest the tendon for reconstructive surgeries, such as repairing damaged tendons in other areas of the body.

How to Check If You Have It

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