Why is the figure on the fingers of the person unique?
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reader, fingerprints are often used in laptops, smartphones, terminals and other external devices
When, in 1910, Thomas Jennings tried to escape from the scene of the murder, he was “lucky” to become the first man in history who was caught through fingerprints left on drying up the railing next to the house. Since fingerprinting, which is a method of human identification due to the unique pattern on the skin, continues to be listed as the most important evidence in forensic investigations. But, clearly, there were not for entering into the database of the police. So why a person has papillary patterns on the skin of the hands and what biological role they perform? Let's try to understand this in this article.
what do human patterns on the fingers?
In the course of work on the study of papillary pattern on the skin, the experts were two theories about their biological destiny. So, drawing on the fingers of a person may be needed to improve the adhesion with any surface, or to enhance sensory perception. For a long time the dominant theory was the creation of a better grip thanks to the tiny depressions and elevations on the as the same way a modern car tires. In order to test this hypothesis, the researchers conducted a laboratory experiment to identify the functional similarities of patterns of the fingers with the principle of automobile tires.
According to an article published on the portal , in the course of the experiment, the experts drew special plate of glass using pads, changing the amount of pressure. As it turned out later, the actual contact area was reduced as compared to smooth areas of the skin that can serve as a refutation of the theory of the creation of an additional clutch.
Papillary pattern can play a big role in the sense of touch
We Know that our fingers have four types of mechanoreceptors or cells that respond to mechanical stimulation and touch. In order to confirm or refute the theory about the increase in sensory abilities, the scientists studied the Pacini corpuscles, which are found at a distance of about 2 millimeters at their fingertips and are responsible for the perception of subtle textures and light vibrations.
For the next experiment, the researchers constructed biomimetically tactile sensor that can detect vibration, similar to a human Taurus Pacini. One version of the device was created with a smooth structure, and the second had a raised surface, similar . In addition, the ribbed surface increased the frequency of the oscillations, which are very sensitive Pacini corpuscles. Scientists suggest that the fingerprints amplify vibrations point and direct them to the sensors under the skin, strengthening delicate detailed sensory information about the surface. Of the experiment was sufficient to confirm assumptions about their biological functions in nature.
Scientists suggest that the process of seizure of any object is also associated with our prints. Due to its specific pattern on the fingers, we are able not only to keep the subject in hand, but also feel the degree of fixation of the object so that, when necessary, to strengthen the grip in the event of a slip.
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