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The research on dermatoglyphic study based on finger print patterns, total finger ridge count, total
number of triradius, a-b ridge count and atd angle in simian crease group (the human Masukakegata)
was conducted at Minangkabau ethnic. The study used a purposive sampling method for the
simian crease group and random sampling for the normal group. Data processing used qualitative
and quantitative descriptive method and it was carried out in the Laboratory of Genetics and Cell
Biology, Department of Biology, Faculty of Mathematics and Natural Sciences, University of
Andalas, Padang, West Sumatra. The results showed that the finger print pattern on the simian
crease group was significantly different to the normal group. There was increased frequency of
whorls in simian crease group. While the total finger ridge count, total number of triradius, a-b
ridge count and atd angle on simian crease group were not significantly different to the normal
group. The atd angle was recommended to be one of the other markers to predict rapidly trisomy 21
besides simian crease on palmar and proposed to no longer define the simian line just as
characteristic of people with Down’s syndrome.
Keywords: dermatoglyphic, simian crease.