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In anatomy, a nail is a horn-like piece at the end of a human or animal finger or toe. See also claw and hoof.
Fingernails and toenails are composed of
Fingernails require 3 to 6 months to completely regrow. Toenails require 12 to 18 months. Any major illness will cause a groove to form in the nails, marking in time the past medical history of its owner. These are called Beau's lines.
Nails can become thickened ( onychogryphosis), loosened ( onycholysis), infected with fungus ( onychomycosis ) or degenerative ( onychodystrophy ); for further information see nail diseases.
A manicure or pedicure is a health and cosmetic procedure to groom, trim and paint the nails. It is accomplished with cuticle scissors, nail scissors, nail clippers, and nail file s. To paint the nails, nail lacquer is manually applied and dried. A large variety of designs is styles can be seen among the fashion-conscious women. In 2003 the first ink nail printer NailJet Pro was released that can print custom hi-resolution colour images on nails [1].
Long nails are commonly seen on women in Western cultures. In the late 20th century19th century 20th century 21st century more centuries) Decades: 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s As a means of recording the passage of time, the 20th century was that century which lasted from 1901- 2000 in the sense of the Gre, artificial nails became widely popular. The artificial nails are not a replacement, but an extension for natural nails. There are two main approaches to creating artificial nails—tips and forms. Tips are lightweight plates that are glued on the natural nail. Forms are fit over the nail and then an artificial nail is molded and the form is removed. With both approaches several materials can be used to glue the tips of form artificial nails. One popular material is acryl—a mixture of powder and ethymethacrylate that hardens in 30–40 seconds after application. Acryl can be removed in 20 minutes using a variety of solvents. Another material, gel, hardens under ultraviolet light and is more lasting and more expensive. It can only be removed by cutting it off. Other materials can be used, as well as combinations of them. There are also cheaper flexible tips that can be quickly glued at home without help from a professional. Artificial nails are produced in a variety of colours and can use "special effects" such as contours, sparkles, etc.
The whole area of the nail is connected to the finger. Because of that removal of a nail can be painful. Sometimes this has to be done for medical reasons (for example, if the nail becomes infected or mechanically damaged; this is usually done under anesthesiaAnesthesia ( AE), also anaesthesia ( BE), is the process of blocking the perception of pain and other sensations. This allows patients to undergo surgery and other procedures without the distress and pain they would otherwise experience. There are several).
Because the procedure is extremely painful, its variations were widely used for tortureTorture is the infliction of severe physical or psychological pain as a means of cruelty, intimidation, punishment, for the extraction of a confession or information or simply for the entertainment of the perpetrator. Signatories of the Third Geneva Conve in the past and are still used occasionally. One variation is pulling the nail off completely with some kind of pliersPliers are hand tools primarily for gripping and cutting that use leverage and numerous different jaw configurations to grip, turn, pull, cut or crimp a variety of things. They are a tool common to many dexterous trades and occupations. History Pliers wer. It was usually administered together with other methods of torture. Another variation is inserting sharp objects under the nails, including needles and metal nailsThis article is about nails as used in engineering. See Nail for other uses of the word. In engineering and construction, a nail is a pin-shaped, sharp object of hard metal, typically steel, used to fasten things together. It is driven into the workpiece. If sterile and sufficiently small tools are used, this method will not leave any permanent damage, while still causing excruciating painPain is both a sensory and emotional experience, generally associated tissue damage, or inflammation. Pain is ultimately a perception, and not an objective bodily state. Despite its unpleasantness, pain is a critical component of the body's defense system.
It is commonly claimed that nails and hair will continue growing for several days after death. This is a myth; the appearance of growth is actually caused by the retraction of skin as the surrounding tissue dehydrates, making nails and hair more prominent.
| Integumentary system |
| Skin - Hair - Nails |
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