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The 2D:4D ratio is calculated by dividing the length of the index finger by the length of the ring finger of the same hand. Other digit ratios are also calculated similarly in the same hand. The digit length is typically measured on the palmar (ventral, "palm-side") hand, from the midpoint of the bottom crease to the tip of the finger. [8]
The index finger (also referred to as forefinger, [1] first finger, [2] second finger, [3] pointer finger, trigger finger, digitus secundus, digitus II, and many other terms) is the second digit of a human hand. It is located between the thumb and the middle finger. It is usually the most dextrous and sensitive digit of the hand, though not the ...
The second finger is another ambiguous term in English. It might refer to either the index finger or the middle finger, also dependent on context. The same can be said for the third finger (referring to either the middle finger or the ring finger); and the fourth finger (referencing either the ring finger or the pinky).
The difference in finger length is caused by the amount of testosterone and estrogen one receives in the womb. More testosterone means a shorter index finger compared to the ring finger, and more ...
The relative length of the digit varies during motion of the IP joints. The length of the palmar aspect decreases during flexion while the dorsal aspect increases by about 24 mm. The useful range of motion of the PIP joint is 30–70°, increasing from the index finger to the little finger.
The ring finger, third finger, [1] fourth finger, [2] [3] leech finger, [4] or annulary is the fourth digit of the human hand, located between the middle finger and the little finger. [ 5 ] Sometimes the term ring finger only refers to the fourth digit of a left-hand , so named for its traditional association with wedding rings in many ...
The ratio of the length of the index finger to the length of the ring finger in adults is affected by the level of exposure to male sex hormones of the embryo in utero. This digit ratio is below 1 for both sexes but it is lower in males than in females on average.
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