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Embryology - Semiology - Dysmorphology







HANDS

The palm is characterized by:

CREASES:

Fusion of (complete fusion or bridge between) the 2 transverse creases is called single transverse crease, transverse palmar crease, or simian crease.

DERMATOGLYPHICS:

Triradius: point of convergence of ridges from 3 different directions. Normally, there is:

From each palmar triradius a, b, c, d, and t, is drawn the 3 lines separating the ridges at this convergence point. The longest is the main line (-- A B C D & T), ending at a side of the palm numbered from 1 to 14 (see Figure).


On the fingers may be counted the number of ridges from the center of the pattern to the triradius. (example here: n = 4); in case of an arch, n=0. For the 10 fingers, males have 140 - 145 ridges, and female have 120 - 130 ridges, according to the formula: n = 187 - (30 * no of X) - (12 * no of Y); this may be very useful in the Underground to determine the sex of the person next to you, and to pass the time.




METACARPO- OR METATARSO-PHALANGEAL ANOMALIES


NUMERICAL ANOMALIES:

SIZE ANOMALIES:

SHAPE ANOMALIES:

As isolated signs, these anomalies are often transmitted as autosomal dominant traits.











Contributor(s)

Written2000-07Jean-Loup Huret
Genetics, Dept Medical Information, University of Poitiers, CHU Poitiers Hospital, F-86021 Poitiers, France

© Atlas of Genetics and Cytogenetics in Oncology and Haematology
indexed on : Tue Mar 14 13:57:42 CET 2017


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