Papillary ridge
Under ridges , ancient Greek Dermatoglyphics , refers to the characteristic lines in the skin of the palm and the sole of the foot . This type of skin is also known as the inguinal skin . These skin ridges arise because the papillae ( stratum papillare ) of the dermis are arranged in longitudinal rows. Each skin ridge is underlaid by two rows of papillary bodies. Since these lines are unique to each person , they are used for personal identification .
Papillary ridges are also found in other animal species, for example gorillas and koalas .
Fingerprints
Fingerprints are images of the so-called papillary lines. A fingerprint does not only depend on genetic makeup , but on numerous factors, not all of which are known to science. One of the theories is that the diet of the unborn child determines the shape of the pattern that develops by the fourth embryonic month.
The pattern of the papillary lines remains largely unchanged until death, which means that a fingerprint is individual ; however, the phenomenon of the formation of intermediate ridges can occasionally be observed. Since the structure of the intermediate ridges differs from the papillary lines, it is still possible to assign fingerprints. In addition, it was possible to prove that intermediate ridges that have been formed are retained over the long term, thus increasing the individuality of a fingerprint.
The formation of intermediate ridges is triggered by natural aging processes in which the distance between the papillary lines increases. However, a larger papillary line spacing reduces the tactility of the fingertip. In order to maintain this, intermediate strips are now drawn in.
No two people have ever been found with the same fingerprint, not even identical twins .
Related terms
literature
- Mark Changizi, Romann Weber, Ritesh Kotecha, Joseph Palazzo: Are Wet-Induced Wrinkled Fingers Primate Rain Treads? In: Brain, Behavior and Evolution. Online advance publication: June 23, 2011, doi: 10.1159 / 000328223
Web links
- Intermediate strips - the changeable part of the human fingerprint (PDF; 13.5 MB)
- Environmental resistance and the histo-morphological correlate of the intermediate ridges, a largely unknown structure of the human groin skin (PDF; 6.5 MB)
- Fingerprints are also slowly changing
Individual evidence
- ^ Animal fingerprints , school project
- ↑ Maciej Henneberg, Kosette M. Lambert, Chris M. Leigh: Fingerprint homoplasy: koalas and humans. ( Memento of February 4, 2012 on WebCite ) naturalscience.com, March 11, 1997.
- ↑ Fingerprints also change slowly. 3sat nano , accessed November 5, 2011.
- ↑ Are identical twins' fingerprints identical? In: Spectrum of Science Publishing House. January 8, 2002, accessed February 5, 2015 .