The word ‘dermatoglyphics‘ was first coined by Harold Cummins in 1926, and refers to the study of the characteristics in the skin ridges of the hands and the feet. What are the most common dermatoglyphic characteristics?
In most populations around the world is the ‘ulnar loop’ the most observed fingerprint pattern (see: the fingerprint of the pinky finger in the picture above). Loops are most frequently found on the little finger (and middle finger); loops are least frequently found on the pointer finger.
The variations in the dermatoglyphics of the handpalm are much more complex than the variations in the fingerprints. An important element concerns the presence of the ‘palmar triradii’ (see: a, b, c, d, and t in the picture above): normally each finger is featured with a palmar triradius – triradius t belongs to the thumb (the thumb mouse – a.k.a. as the ‘thenar’, or in palmistry: ‘mount of Venus’ could be recognized as the third phalange of the thumb).
T = L + D – 1
More details available via:
Picture: example of a normal pattern of dermatoglypics [NOTICE: If the 'c-line' is ending between the ring- and middle finger it always creates a palmar 'loop', which implicates that the author of the picture has missed 6th palmar triradius between/below the c and d triradius]
January 19, 2010
In 1963 L.S. Penrose presented the first ‘phantom picture’ describing the typical hand characteristics in Down syndrome. More detailed ‘phantom pictures’ were presented by Schaumann & Alter (1976), Rodewald (1981). This month (2010) a more detailed updated version of the visualisation became available – featuring 27 characteristics of the hand in Down’s syndrome!
What are the most common hand characteristics in Down syndrome?
NOTICE: The author of the new ‘phantom picture’ for Down syndrome described a specific guideline which states that in all cases of Down syndrome certain combinations of the 27 characteristics are found in both the fingers AND the palm of the hand!
More details available at:
Photo: example of a baby hand in Down syndrome