Distribution of the minutiae in palmprints: Topological andsexual variability
Identifiers
Permanent link (URI): http://hdl.handle.net/10017/59872DOI: 10.1111/1556-4029.14583
ISSN: 0022-1198
Date
2020Bibliographic citation
Journal of Forensic Sciences, 2020, v. , n. 66, p. 135-
Keywords
Minutiae
Palmprints
Identification
Sexual differences
Distal
Thenar
Hypothenar
Document type
info:eu-repo/semantics/article
Version
info:eu-repo/semantics/publishedVersion
Rights
© 2020 American Academy of Forensic Sciences
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Access rights
info:eu-repo/semantics/openAccess
Abstract
Palmprints have been systematically less studied than fingerprints, despite being of great use in the identification process. In Spain, they were not included in Automated Fingerprint Identification Systems (AFIS) until 2009. Very few investigations performed within the field of palmprints have assessed the sexual and population variability of the number and distribution of minutiae on its surface, despite the fact that these particularities are the basis for personal identification in forensic science. That is why a study was conducted to assess total, bimanual and sexual density per morphological regions (superior or distal, thenar and hypothenar) and per counting areas of 1cm2 on 120 palmprints obtained from 30 male and 30 female individuals of Spanish nationality. Also, the frequency in the location of each type of delta or triradius (a, b, c, d and t) per count area was calculated. Results have shown a topological variability in the distribution of the density of minutiae, which is similar between sexes and a specular effect between both hands. The most frequent locations of the deltas coincide with areas of high minutiae density. It has also been shown that there are sexual differences in the total number of minutiae, which cannot be due to sexual dimorphism in adult hand size, since minutiae are established at an early stage of fetal development and their number will not change during later postnatal growth. These differences can only be attributed to genetic factors related to the number and type of sex chromosomes.
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