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

How to Check If You Have It

Want to see if you have the palmaris longus tendon? Try this simple test:

1. Place your arm flat on a table or a smooth surface with your palm facing up.
2. Touch your pinky finger to your thumb.
3. Slightly flex your wrist upwards.
4. Look at your wrist—do you see a raised tendon running down the middle?
   • If yes: You have the palmaris longus tendon!
   • If no: You are among the percentage of people who do not have it, and that’s completely normal!

The Fascinating Connection to Evolution

The presence (or absence) of this tendon is just one of the many fascinating remnants of our evolutionary past. Similar to the appendix and wisdom teeth, the palmaris longus tendon is considered an atavistic trait—one that has diminished in function over time.

Final Thoughts

Whether you have this tendon or not, it’s an interesting way to reflect on the wonders of the human body. Next time you’re with friends or family, try the test together and compare results—it’s a fun and simple way to learn a little more about our anatomy!