Why Do We Have Lines On Our Palms?

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The lines on our palms are known as palmar flexion creases, and they’re there to help us fold, stretch, squeeze, scrunch and do other such things without excessively stretching or squeezing the skin on the hands.

Stop what you’re doing and stick the palms of both hands in front of your face. What do you see? A bunch of lines crisscrossing all across your palms, right?

Photo Credit: Pixabay

Have you ever wondered why they are there since they seem to serve no purpose (or so it seems)?

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Palmar Flexion Creases

The lines on our palms are scientifically known as palmar flexion creases. These creases begin to form around the 12th week of gestation (when the baby is developing in the womb), which means we are all born with these lines on our palms.

Kid hand palm
We are all born with these palm lines. (Photo Credit: Pexels)

The primary function of the palmar flexion creases is to help the skin of the palm squeeze and stretch. It is only along these lines that the skin of the hand folds or bunches up in accordance with the relevant position of the hand, such as during curling, stretching, and fist-making.

Scientists have studied these seemingly random lines on our palms and created multiple classification systems for the creases. If you take another glance at your palm, you’ll see three deep and prominent creases. The uppermost horizontal line is the distal palmar crease, below which is another horizontal line called the proximal palmar crease. Lastly, an arc starting from the proximal palmar crease down to your wrist is the thenar crease or radial longitudinal crease. They are the primary palmar creases.

The creases on the palm help the skin to fold and stretch. (Photo Credit: Pixabay)

Besides this physical advantage, palmar flexion creases can also help identify certain congenital disorders in an individual.

Also Read: Why Do Babies Close Their Fists So Tightly Around Your Fingers?

The Reason We Have Lines On Our Palms

Hands are undeniably one of the hardest working organs (amongst the external ones) of the body. Please think of the plethora of physical activities you do with them day in, day out. You constantly pick things up, pull/push, squeeze, turn and twist things with your hands. It’s actually quite pointless to list all the activities we do with our hands because there are just so many!

For your hands to perform all these physical activities, the skin that covers them must be able to adapt to complex positions. Therefore, if you stretch, fold, bend or fist your palms, the skin must be able to follow suit.

If it were not for the lines on our palms, bags of loose skin would be hanging out from under our palms and fingers. Not only would that be a terrible waste of skin tissue, but also a rather unpleasant sight to behold.

Also Read: How Do Fingers Work If They Don’t Contain Muscles?

Can Reading Palm Lines (Palmistry) Foretell The Future?

A sizable portion of the public actually believes that the lines on our palms can help foretell our future. Fortune tellers around the world make a living reading people’s palms and predicting their future!

Old man black & white hand palm lines
Can the lines on our palms foretell the future? (Photo Credit: Wikipedia)

Today, however, due to a serious lack of empirical support behind palmistry’s predictions, palmistry is considered a superstitious or pseudoscientific belief. There are different and sometimes contradictory interpretations of the same lines on an individual’s palms in different cultures.

In other words, if you are someone who believes in an idea or a theory only when there is sufficient scientific research and evidence to support it, then going to a fortune teller to help you predict the outcome of a test, a business deal, or any other (future) event of your life is certainly not an option for you, at least until the “powers that be” accept palmistry as a ‘regular’ science.

References (click to expand)
  1. Palmistry - Wikipedia. Wikipedia
  2. Single transverse palmar crease - Wikipedia. Wikipedia
  3. Why Humans Have Palm Lines | Palmar creases - Live Science. Live Science
About the Author

Ashish is a Science graduate (Bachelor of Science) from Punjabi University (India). He spearheads the content and editorial wing of ScienceABC and manages its official Youtube channel. He’s a Harry Potter fan and tries, in vain, to use spells and charms (Accio! [insert object name]) in real life to get things done. He totally gets why JRR Tolkien would create, from scratch, a language spoken by elves, and tries to bring the same passion in everything he does. A big admirer of Richard Feynman and Nikola Tesla, he obsesses over how thoroughly science dictates every aspect of life… in this universe, at least.

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