Liam Carter
Fingernails are the protective plates found at the tips of our fingers. They are made of a tough, rigid protein called alpha-keratin, which is also found in the claws, hooves and horns of vertebrates.
| Characteristics | Values |
|---|---|
| What it is | A protective plate found at the tip of the digits (fingers and toes) of all primates |
| What it's made of | A tough rigid protein called alpha-keratin, a polymer also found in the claws, hooves, and horns of vertebrates |
| What it consists of | The nail plate, the nail matrix and the nail bed below it, and the grooves surrounding it |
| What the nail matrix is | The active tissue (or germinal matrix) that generates cells |
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What You'll Learn
Fingernails are made of alpha-keratin
Fingernails are a protective plate found at the tip of the digits (fingers and toes) of all primates. They are made of a tough, rigid protein called alpha-keratin, a polymer also found in the claws, hooves, and horns of vertebrates. The nail consists of the nail plate, the nail matrix and the nail bed below it, and the grooves surrounding it. The nail matrix is the active tissue (or germinal matrix) that generates cells. The cells harden as they move outward from the nail root to the nail plate.
Alpha-keratin is the predominant type of keratin in human nails, providing strength and hardness. Beta-keratin, on the other hand, is more commonly found in the animal kingdom, offering different properties to nails. Alpha-keratin is present in humans and other mammals, whereas beta-keratin occurs in birds and reptiles. The human keratin family is divided into soft epithelial keratins and hard hair-like keratins, the latter being present both in hairs and nails. The nail plate comprises 10–20% soft keratins, in addition to large amounts of hair-like keratins.
The α-keratin of males has more disulphide bonds, and more β-sheet and random coil secondary structures, but fewer α-helical regions. The higher content of disulphide bonds is possible in the α-keratin of males despite the slightly lower Cys content and it renders their fingernail plates stiffer than those of females. Human fingernails are skin appendages. Nail plates are specialised structures that cover distal surfaces of fingers and comprise three histological layers composed of α-keratin – an insoluble biomaterial containing microfibrils of keratin proteins (7–10 nm in diameter) immersed in a matrix of globular, keratin-associated proteins (KAPs).
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Fingernails are protective plates
The primary function of fingernails is to protect the sensitive tips of the fingers and toes. They act as a barrier against minor injuries and provide some degree of insulation. Additionally, fingernails can assist in fine motor skills and dexterity, allowing for more precise movements and manipulations of objects. For example, they can aid in tasks such as picking up small objects or peeling stickers.
The shape and structure of fingernails can also provide some clues about a person's health. Healthy fingernails are typically smooth, slightly curved, and have a consistent colour. Any changes in the appearance of the nails, such as discolouration, ridges, or brittleness, can indicate underlying health issues. For instance, white spots on the nails may suggest a zinc or calcium deficiency, while clubbed nails, where the tips of the fingers become enlarged and the nails curve around the fingertips, can be a sign of low oxygen levels in the blood.
Fingernails also play a role in personal hygiene and grooming. Regular trimming and cleaning of the nails help to prevent the accumulation of dirt and bacteria, reducing the risk of infections. Proper nail care can also enhance the overall appearance of the hands and nails, contributing to personal aesthetics and self-care routines.
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Fingernails are found at the tip of the digits
The nail plate is the hard, translucent part of the nail that we can see. It is made up of dead, flattened cells that are filled with keratin. The nail matrix is the part of the nail that is hidden under the skin. It is here that new nail cells are produced. The nail bed is the soft tissue that lies under the nail plate. It is rich in blood vessels and nerves, which give the nail its pink colour. The grooves surrounding the nail are called the lateral and proximal nail folds. They help to seal the nail plate in place and protect the nail matrix from infection.
Fingernails have several important functions. They help us to grip and manipulate objects, and they also provide some protection for the sensitive tips of our fingers. In addition, the shape and condition of our fingernails can give us important information about our health. For example, ridges or changes in colour can indicate nutrient deficiencies or underlying health conditions.
In conclusion, fingernails are an important part of our anatomy, serving both functional and protective purposes. Their structure and composition make them well-suited to their role, and they can also provide valuable insights into our overall health.
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Fingernails are similar to claws, hooves and horns
Fingernails are protective plates found at the tip of the digits (fingers and toes) of all primates. They correspond to the claws in other tetrapod animals. The nail consists of the nail plate, the nail matrix and the nail bed below it, and the grooves surrounding it. The nail matrix is the active tissue (or germinal matrix) that generates cells. The cells harden as they move outward from the nail root to the nail plate.
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Fingernails are made of cells that harden
Fingernails are made of a tough, rigid protein called alpha-keratin, which is also found in the claws, hooves and horns of vertebrates. The nail consists of the nail plate, the nail matrix and the nail bed below it, and the grooves surrounding it. The nail matrix is the active tissue (or germinal matrix) that generates cells. The cells harden as they move outward from the nail root to the nail plate.
Keratin is the same stuff that makes up hooves, claws and horns in animals. It’s also found in our very own hair and skin. The formation of a nail begins out of sight, inside a part of the fingertip called the nail root. This is where the cells which will eventually form the nail plate gradually die, harden and push out of the skin. As the older cells are compacted and pushed out of the skin by the formation of new cells, they take the hardened, flattened form of the fingernail.
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Frequently asked questions
Fingernails are protective plates found at the tip of the digits (fingers and toes) of all primates. They are made of a tough rigid protein called alpha-keratin, a polymer also found in the claws, hooves, and horns of vertebrates.
Fingernails are the equivalent of claws in other tetrapod animals. They are used for protection.
Fingernails are made of a tough rigid protein called alpha-keratin.
A fingernail consists of the nail plate, the nail matrix and the nail bed below it, and the grooves surrounding it.
