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Paradoxically the two digits that are missing are different: the bird hand (embedded in the wing) is thought to derive from the second, third and fourth digits of the ancestral five-digit hand. In contrast, the theropod dinosaurs seem to have the first, second and third digits.
In the case of primates in general, the digits of the hand are overwhelmingly referred to as "fingers". [5] [6] Primate fingers have both fingernails and fingerprints ...
In the Five-finger system, the first finger usually refers to the thumb (or first digit) in a medical context, [1] or in a musical context when referring to playing keyboard instruments, such as the piano or accordion.
The feet of the front limbs in chameleons, for instance, are organized into a medial bundle of digits 1, 2 and 3, and a lateral bundle of digits 4 and 5, while the feet of the hind limbs are organized into a medial bundle of digits 1 and 2, and a lateral bundle of digits 3, 4 and 5. [10] On the other hand, zygodactyly involves digits 1 and 4 ...
[5] [6] [Note 2] Chinese number gestures count up to 10 but can exhibit some regional differences. In Japan, counting for oneself begins with the palm of one hand open. Like in East Slavic countries, the thumb represents number 1; the little finger is number 5. Digits are folded inwards while counting, starting with the thumb. [7]
The human hand usually has five digits: four fingers plus one thumb; [3] [4] these are often referred to collectively as five fingers, however, whereby the thumb is included as one of the fingers. [ 3 ] [ 5 ] [ 6 ] It has 27 bones, not including the sesamoid bone , the number of which varies among people, [ 7 ] 14 of which are the phalanges ...
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The width of an adult human male finger tip is indeed about 2 centimetres. In English this unit has mostly fallen out of use, as do others based on the human arm: finger (7/6 digit), palm (4 digits), hand (16/3 digits), shaftment (8 digits), span (12 digits), cubit (24 digits) and ell (60 digits).