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Apes usually have a very short thumb,
men have a shorter thumb compared to women
The 'human digital formula' (2D>4D)
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The concept 'human digital formula' is introduced by Wood Jones (The principals of anatomy as seen in the hand, London: Churchill, 1930). Jones discovered that in the hands of apes the absolute length of the ring finger is always longer than the index finger: the phenomenon is being described by Wood Jones by means of the concept: the 'simian digital formula'. In the human hand the absolute length of the ring finger is usually longer than the index finger as well. However in some people the absolute length of the index finger is longer than the ring finger. Wood Jones refers to this condition as the 'human digital formula'. The picture on the right concerns a hand including the 'human digital formula' (the arrows have the same length!) . |