Fingerprint ridges allow primates to regulate grip

Research output: Contribution to journalArticlepeer-review

Standard

Fingerprint ridges allow primates to regulate grip. / Adams, Mike; Yuma, Seoung-Mok ; Baek, In-Keun ; Hong, Dongpyo ; Kim, Juhan ; Jung, Kyunghoon J; Kim, Seontae ; Eom, Kihoon ; Jang, Jeongmin Janga; Kim, Seonmyeong ; Sattorov, Matlabjon ; Lee, Min-Geol ; Kim, Sungwan ; Park, Gun-Sik .

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 117, No. 50, 15.12.2020, p. 31665.

Research output: Contribution to journalArticlepeer-review

Harvard

Adams, M, Yuma, S-M, Baek, I-K, Hong, D, Kim, J, Jung, KJ, Kim, S, Eom, K, Jang, JJ, Kim, S, Sattorov, M, Lee, M-G, Kim, S & Park, G-S 2020, 'Fingerprint ridges allow primates to regulate grip', Proceedings of the National Academy of Sciences of the United States of America, vol. 117, no. 50, pp. 31665.

APA

Adams, M., Yuma, S-M., Baek, I-K., Hong, D., Kim, J., Jung, K. J., Kim, S., Eom, K., Jang, J. J., Kim, S., Sattorov, M., Lee, M-G., Kim, S., & Park, G-S. (2020). Fingerprint ridges allow primates to regulate grip. Proceedings of the National Academy of Sciences of the United States of America, 117(50), 31665.

Vancouver

Author

Adams, Mike ; Yuma, Seoung-Mok ; Baek, In-Keun ; Hong, Dongpyo ; Kim, Juhan ; Jung, Kyunghoon J ; Kim, Seontae ; Eom, Kihoon ; Jang, Jeongmin Janga ; Kim, Seonmyeong ; Sattorov, Matlabjon ; Lee, Min-Geol ; Kim, Sungwan ; Park, Gun-Sik . / Fingerprint ridges allow primates to regulate grip. In: Proceedings of the National Academy of Sciences of the United States of America. 2020 ; Vol. 117, No. 50. pp. 31665.

Bibtex

@article{9c78f0d84c0045e2b5268812f1383800,
title = "Fingerprint ridges allow primates to regulate grip",
abstract = "Fingerprints are unique to primates and koalas but what advantagesdo these features of our hands and feet provide us comparedwith the smooth pads of carnivorans, e.g., feline or ursinespecies? It has been argued that the epidermal ridges on fingerpads decrease friction when in contact with smooth surfaces,promote interlocking with rough surfaces, channel excess water,prevent blistering, and enhance tactile sensitivity. Here, we foundthat they were at the origin of a moisture-regulating mechanism,which ensures an optimal hydration of the keratin layer of theskin for maximizing the friction and reducing the probability ofcatastrophic slip due to the hydrodynamic formation of a fluidlayer. When in contact with impermeable surfaces, the occlusionof the sweat from the pores in the ridges promotes plasticizationof the skin, dramatically increasing friction. Occlusion andexternal moisture could cause an excess of water that woulddefeat the natural hydration balance. However, we have demonstratedusing femtosecond laser-based polarization-tunable terahertzwave spectroscopic imaging and infrared optical coherencetomography that the moisture regulation may be explained bya combination of a microfluidic capillary evaporation mechanismand a sweat pore blocking mechanism. This results in maintainingan optimal amount of moisture in the furrows that maximizesthe friction irrespective of whether a finger pad is initially wetor dry. Thus, abundant low-flow sweat glands and epidermal furrowshave provided primates with the evolutionary advantage indry and wet conditions of manipulative and locomotive abilitiesnot available to other animals.",
keywords = "epidermal ridge function j finger pad friction j moisture regulation j capillary evaporation",
author = "Mike Adams and Seoung-Mok Yuma and In-Keun Baek and Dongpyo Hong and Juhan Kim and Jung, {Kyunghoon J} and Seontae Kim and Kihoon Eom and Jang, {Jeongmin Janga} and Seonmyeong Kim and Matlabjon Sattorov and Min-Geol Lee and Sungwan Kim and Gun-Sik Park",
year = "2020",
month = dec,
day = "15",
language = "English",
volume = "117",
pages = "31665",
journal = "Proceedings of the National Academy of Sciences",
issn = "1091-6490",
publisher = "National Academy of Sciences",
number = "50",

}

RIS

TY - JOUR

T1 - Fingerprint ridges allow primates to regulate grip

AU - Adams, Mike

AU - Yuma, Seoung-Mok

AU - Baek, In-Keun

AU - Hong, Dongpyo

AU - Kim, Juhan

AU - Jung, Kyunghoon J

AU - Kim, Seontae

AU - Eom, Kihoon

AU - Jang, Jeongmin Janga

AU - Kim, Seonmyeong

AU - Sattorov, Matlabjon

AU - Lee, Min-Geol

AU - Kim, Sungwan

AU - Park, Gun-Sik

PY - 2020/12/15

Y1 - 2020/12/15

N2 - Fingerprints are unique to primates and koalas but what advantagesdo these features of our hands and feet provide us comparedwith the smooth pads of carnivorans, e.g., feline or ursinespecies? It has been argued that the epidermal ridges on fingerpads decrease friction when in contact with smooth surfaces,promote interlocking with rough surfaces, channel excess water,prevent blistering, and enhance tactile sensitivity. Here, we foundthat they were at the origin of a moisture-regulating mechanism,which ensures an optimal hydration of the keratin layer of theskin for maximizing the friction and reducing the probability ofcatastrophic slip due to the hydrodynamic formation of a fluidlayer. When in contact with impermeable surfaces, the occlusionof the sweat from the pores in the ridges promotes plasticizationof the skin, dramatically increasing friction. Occlusion andexternal moisture could cause an excess of water that woulddefeat the natural hydration balance. However, we have demonstratedusing femtosecond laser-based polarization-tunable terahertzwave spectroscopic imaging and infrared optical coherencetomography that the moisture regulation may be explained bya combination of a microfluidic capillary evaporation mechanismand a sweat pore blocking mechanism. This results in maintainingan optimal amount of moisture in the furrows that maximizesthe friction irrespective of whether a finger pad is initially wetor dry. Thus, abundant low-flow sweat glands and epidermal furrowshave provided primates with the evolutionary advantage indry and wet conditions of manipulative and locomotive abilitiesnot available to other animals.

AB - Fingerprints are unique to primates and koalas but what advantagesdo these features of our hands and feet provide us comparedwith the smooth pads of carnivorans, e.g., feline or ursinespecies? It has been argued that the epidermal ridges on fingerpads decrease friction when in contact with smooth surfaces,promote interlocking with rough surfaces, channel excess water,prevent blistering, and enhance tactile sensitivity. Here, we foundthat they were at the origin of a moisture-regulating mechanism,which ensures an optimal hydration of the keratin layer of theskin for maximizing the friction and reducing the probability ofcatastrophic slip due to the hydrodynamic formation of a fluidlayer. When in contact with impermeable surfaces, the occlusionof the sweat from the pores in the ridges promotes plasticizationof the skin, dramatically increasing friction. Occlusion andexternal moisture could cause an excess of water that woulddefeat the natural hydration balance. However, we have demonstratedusing femtosecond laser-based polarization-tunable terahertzwave spectroscopic imaging and infrared optical coherencetomography that the moisture regulation may be explained bya combination of a microfluidic capillary evaporation mechanismand a sweat pore blocking mechanism. This results in maintainingan optimal amount of moisture in the furrows that maximizesthe friction irrespective of whether a finger pad is initially wetor dry. Thus, abundant low-flow sweat glands and epidermal furrowshave provided primates with the evolutionary advantage indry and wet conditions of manipulative and locomotive abilitiesnot available to other animals.

KW - epidermal ridge function j finger pad friction j moisture regulation j capillary evaporation

M3 - Article

VL - 117

SP - 31665

JO - Proceedings of the National Academy of Sciences

JF - Proceedings of the National Academy of Sciences

SN - 1091-6490

IS - 50

ER -