olemus
reljeefselt eenduv nahaosa
sõrmede, varvaste, peopesa, talla pinnal

ISO/IEC 19794-1:
sõrme, varba, peopesa, talla nahakurd,
mis normaalsel puudutusel
puutub kokku mingi juhupinnaga;
sõrmedel moodustavad papillaarkurdude
kordumatud mustrid sõrmejälje
=
ridge present on the skin of the fingers and toes, the palms and soles of the feet, which makes contact with an incident surface under normal touch
Note. On the fingers, the unique patterns formed by the friction ridges make up fingerprints.

piltlikult
http://slideplayer.com/slide/4736812/15/images/7/WHAT+ARE+FRICTION+RIDGES.jpg

https://duckduckgo.com/?q=friction+ridges&t=h_&iax=images&ia=images
http://slideplayer.com/slide/4736812/15/images/7/WHAT+ARE+FRICTION+RIDGES.jpg

https://image.slidesharecdn.com/uniquenessandpermanenceoffrictionridge-100423092144-phpapp02/95/uniqueness-and-permanence-of-friction-ridge-10-728.jpg

ülevaateid
https://evolveforensics.com/wp-content/uploads/2015/07/Maceo-Alice.-Friction-Ridge-Skin-Morphogenesis-and-Overview.pdf

https://www.crime-scene-investigator.net/fingerprintsourcebookchp2.pdf

https://irp.fas.org/eprint/fingerprint.pdf

vt ka
- papillaarpildindus