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WHY DO HUMANS HAVE PALM LINES?

WHY DO HUMANS HAVE PALM LINES?
Ever wondered why there are lines on your palm?
  Some people think the palm lines in human hands foretell the future through what is called palmistry.
 
source:youtube.com
 However, scientifically speaking, the lines on a palm, or palmer flexion creases, help the hand's skin stretch and squeeze. They can also help identify certain medical conditions.

When you clench your hand, palm lines provide an avenue for the hand's skin to fold without bunching up and making it difficult to grab onto items. That may also be why there are strong creases where the bones in the fingers and thumb meet.

Most people have three prominent creases across the surface of their palms, but sometimes there is only one crease, according to the NIH.

The thickness and number of creases on your palms also depend on factors such as family history and race.

Having only a single palmer crease might indicate abnormal development.

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