Compare the lines on the palm to other crease lines on the body e.g elbow/back of knee/wrist these crease lines aren't as well defined as the line on the palm if you stretch out your arm the elbow crease becomes fainter but stretch your hand and the palmar line appear stronger there are no markings on the elbow or other creases such as we see on the line lines of the hand-(how could the markings be caused by folding ?) there are lines on the hand where the skin doesn't fold and places where the hand folds but there is no distinct line