Difference between revisions of "Fingerprints"
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| − | *[ | + | *[https://en.wikipedia.org/wiki/19th_century 1859] |
==Definitions== | ==Definitions== | ||
*1: the [[impression]] of a fingertip on any [[surface]]; also : an ink impression of the lines upon the fingertip taken for the [[purpose]] of [[identification]] | *1: the [[impression]] of a fingertip on any [[surface]]; also : an ink impression of the lines upon the fingertip taken for the [[purpose]] of [[identification]] | ||
*2: something that identifies: as a : a [[trait]], trace, or characteristic revealing [[origin]] or [[responsibility]] | *2: something that identifies: as a : a [[trait]], trace, or characteristic revealing [[origin]] or [[responsibility]] | ||
| − | :b : analytical [[evidence]] (as a [ | + | :b : analytical [[evidence]] (as a [https://en.wikipedia.org/wiki/Spectrogram spectrogram]) that characterizes an object or substance; especially : the [https://en.wikipedia.org/wiki/Chromatogram chromatogram] or [https://en.wikipedia.org/wiki/Electrophoretogram electrophoretogram] obtained by cleaving a [[protein]] by enzymatic action and subjecting the resulting collection of peptides to two-dimensional chromatography or electrophoresis |
:c : the base-pair pattern in an [[individual]]'s [[DNA]] obtained by DNA fingerprinting | :c : the base-pair pattern in an [[individual]]'s [[DNA]] obtained by DNA fingerprinting | ||
==Description== | ==Description== | ||
| − | A '''fingerprint''' in its narrow sense is an [[impression]] left by the [ | + | A '''fingerprint''' in its narrow sense is an [[impression]] left by the [https://en.wikipedia.org/wiki/Friction_ridge friction ridges] of a human finger. In a wider use of the term, fingerprints are the traces of an impression from the friction ridges of any part of a human or other primate hand. A print from the foot can also leave an impression of friction ridges. A friction ridge is a raised portion of the [https://en.wikipedia.org/wiki/Epidermis_(skin) epidermis] on the digits (fingers and toes), the palm of the hand or the sole of the foot, consisting of one or more connected ridge units of friction ridge skin. These are sometimes known as "epidermal ridges" which are caused by the underlying [[interface]] between the dermal [https://en.wiktionary.org/wiki/papilla papillae] of the dermis and the interpapillary (rete) pegs of the epidermis. These epidermal ridges serve to amplify [[vibrations]] triggered, for example, when fingertips brush across an uneven surface, better [[transmitting]] the signals to sensory [[nerves]] involved in fine texture [[perception]]. These ridges also assist in gripping rough [[surfaces]], as well as smooth wet surfaces. |
| − | [[Impressions]] of fingerprints may be left behind on a [[surface]] by the natural secretions of [[sweat]] from the [ | + | [[Impressions]] of fingerprints may be left behind on a [[surface]] by the natural secretions of [[sweat]] from the [https://en.wikipedia.org/wiki/Eccrine_gland eccrine glands] that are present in [https://en.wikipedia.org/wiki/Friction_ridge friction ridge] skin, or they may be made by ink or other substances transferred from the peaks of friction ridges on the skin to a relatively smooth [[surface]] such as a fingerprint card. Fingerprint records normally contain impressions from the pad on the last joint of fingers and thumbs, although fingerprint cards also typically record portions of lower joint areas of the fingers.[https://en.wikipedia.org/wiki/Fingerprint] |
[[Category: Physiology]] | [[Category: Physiology]] | ||
Latest revision as of 00:03, 13 December 2020
Definitions
- 1: the impression of a fingertip on any surface; also : an ink impression of the lines upon the fingertip taken for the purpose of identification
- 2: something that identifies: as a : a trait, trace, or characteristic revealing origin or responsibility
- b : analytical evidence (as a spectrogram) that characterizes an object or substance; especially : the chromatogram or electrophoretogram obtained by cleaving a protein by enzymatic action and subjecting the resulting collection of peptides to two-dimensional chromatography or electrophoresis
- c : the base-pair pattern in an individual's DNA obtained by DNA fingerprinting
Description
A fingerprint in its narrow sense is an impression left by the friction ridges of a human finger. In a wider use of the term, fingerprints are the traces of an impression from the friction ridges of any part of a human or other primate hand. A print from the foot can also leave an impression of friction ridges. A friction ridge is a raised portion of the epidermis on the digits (fingers and toes), the palm of the hand or the sole of the foot, consisting of one or more connected ridge units of friction ridge skin. These are sometimes known as "epidermal ridges" which are caused by the underlying interface between the dermal papillae of the dermis and the interpapillary (rete) pegs of the epidermis. These epidermal ridges serve to amplify vibrations triggered, for example, when fingertips brush across an uneven surface, better transmitting the signals to sensory nerves involved in fine texture perception. These ridges also assist in gripping rough surfaces, as well as smooth wet surfaces.
Impressions of fingerprints may be left behind on a surface by the natural secretions of sweat from the eccrine glands that are present in friction ridge skin, or they may be made by ink or other substances transferred from the peaks of friction ridges on the skin to a relatively smooth surface such as a fingerprint card. Fingerprint records normally contain impressions from the pad on the last joint of fingers and thumbs, although fingerprint cards also typically record portions of lower joint areas of the fingers.[1]
