HANDS – Five major differences between the primate hand and the human hand!
November 18, 2009
|‘Whorls’ are a common features in the hands of many primate species!
What are the major differences between the hands of primate species and the human?
• 1 – Primates usually have a shorter thumb than humans – the thumb of the macaque (see photo on the left) does not rearch out behond the distal border of the handpalm.
• 2 – Primates usually have a lower ‘2D:4D digit ratio’ than humans – the hand of the macaque is featured with a much longer ring finger (digit 4) than the pointer finger (digit 2).
|• 3 – Primates usually have more fingerprint- and palmar whorls than humans – the hand of the macaque is featured with 5 palmar whorls.
• 4 – Primates always have a lower ‘ridge density’ than humans.
• 5 – Primates usually have (various) palmar transversal creases, a.k.a. ‘simian lines’ – the hand of the macaque has one ‘simian line’.
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PHOTO: Impression from the back of the hand of a macaque: