Briefly explains: What is the Palmaris Longus muscle?
A narrow, superficial muscle in the forearm
Runs from the inside of the elbow to the palm
Function: bowing of the wrist, voltage of palmaraponeurosis (connective tissue in the palm)
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This recipe
How do you recognize whether you have it?
The tendon test:

Put the forearm on the table, palm up.
Touch your thumb and little finger lightly.
Spread the wrist lightly.
👉 If a thin tendon arches in the middle of the wrist, you have the Palmaris Longus muscle.

🔍 If you have it, that means …?
… actually nothing at all😄

No advantage or disadvantage in everyday life or for health
No effects on strength, mobility or skill
The muscle is no longer absolutely necessary
In fact, the Palmaris Longus is often used as a “donor muscle” for tendon reconstructions during operations (e.g. for thumb or wrist injuries) because its loss does not cause functional disorder.

Fun fact:
The muscle is a remnant from evolution – for some primates it is important for climbing.
The loss of modern people shows that we no longer need it.
✅ Conclusion:
If you have the Palmaris Longus Musculus: Congratulations! You wear a small piece of evolutionary history with you.
If not – just as good. Your body can cope well without him.

Would you like to get to know other exciting “hidden body features” or tests on the evolutionary biology of your body? I would be happy to put you together!