what determines what the lines on the palms of your hands look like and why aren’t they mirror images?
In: Biology
These are known as palmar flexion creases, and their purpose is to allow the skin on our hands to bend & fold without creating obstructions which could make grabbing or holding things difficult.
The lines are developed before birth, and their form & structure is determined by ancestry and race. “Why” they are not mirror images I’m unsure, but I’d assume it’s the same as any other developmental trait, such that genes & developmental factors play a role.
Edit: just to expand on the parallelism between hands, there is likely to be some variation when compared. This is just general developmental variation, affected by many, many different things while you’re growing inside mom, such as nutrients, hormone levels, activity, maybe even temperature, etc.
Developmental biology is not well understood, and we’re still trying to figure out why things happen the way they do.
Get a bag. Scrunch it up thousands of times.
You’ll get lines of wear and creases, and they won’t be on exactly the same place, even starting with two identical bags.
The general layout of lines on my hands pretty much are a mirror image. Is that not typical ?
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