Noah Sinclair
Nails are a protective plate found at the tip of the digits (fingers and toes) of primates, corresponding to the claws in other tetrapod animals. They are made of a tough rigid protein called alpha-keratin, which is also found in the claws, hooves, and horns of vertebrates. The main function of toenails is likely protection, while fingernails help enhance grip and fine motor functions. Nails also contain important clues to our health status, lifestyle, and recreational habits.
| Characteristics | Values |
|---|---|
| Material | A tough rigid protein called alpha-keratin |
| Formation | Begins inside a part of the fingertip called the nail root |
| Function | Protection, grip, fine motor skills, opening things, scratching an itch, picking up tiny objects, self-defence, removing lice, ticks and other pests |
| Health | Nail appearance can indicate underlying health conditions, nutrient deficiencies, stress, lifestyle, and recreational habits |
| Growth rate | The growth rate of nails is related to the length of the terminal phalanges (outermost finger bones). In humans, the nail of the index finger grows faster than that of the little finger; and fingernails grow up to four times faster than toenails. |
| Diseases and disorders | Nail infections, clubbing, concavity (koilonychia), subungual melanoma, peripheral cyanosis |
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What You'll Learn
Nails are made of a tough protein called keratin
There are two types of keratin: alpha-keratin and beta-keratin. Alpha-keratin is found in the hair, epidermis, horns, nails, claws, and hooves of mammals. Beta-keratin, on the other hand, is found in the feathers, beaks, claws, and scales of birds and reptiles. Alpha-keratin is mostly fibrous, with a helical structure, while beta-keratin forms sheets of polypeptide chains that give it a rigid structure.
Keratin is produced naturally by the body and plays an important role in supporting and protecting the skin, nails, and hair. It helps to keep nails strong and healthy, and it can also be found in the nail matrix, the active tissue that generates nail cells. As these cells move outward from the nail root to the nail plate, they harden, contributing to the overall strength and protection provided by nails.
The importance of keratin goes beyond just nails. It also has applications in cosmetic treatments, such as keratin hair treatments, which are believed to make hair stronger, brighter, and softer. However, it's important to note that there is limited scientific evidence to support the effectiveness of keratin supplements for hair strength. Additionally, the source of keratin in some cosmetic products may be from ground-up animal parts, which may be a concern for vegetarians.
In summary, the tough protein keratin is an essential component of nails, providing them with strength and protection. Its unique structure and properties contribute to its functionality in the body, making it an important element in maintaining the integrity and health of nails, hair, and skin.
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They help with fine motor skills
Fingernails and toenails are made of a tough, rigid protein called alpha-keratin, a polymer also found in the claws, hooves, and horns of vertebrates. The keratin fibres in our nails are packed closely together, making them denser than the keratin in our hair and skin. Nails are a protective plate found at the tip of the digits (fingers and toes) of all primates, corresponding to the claws in other tetrapod animals.
Nails help with fine motor skills in several ways. Firstly, they help us open things, scratch itches, and pick up tiny objects. The strength and existence of fingernails, for example, prevent our fingertips from rolling backward when we hold something. They also enhance our grip by offering a solid surface for the pads of our fingers to press against when we grip something tightly. This enhanced grip function is particularly useful for manual tasks such as opening a drink can or peeling an orange.
In addition to their functional benefits, fingernails can also provide important health clues. For example, they can indicate potential underlying problems such as nutritional deficiencies or medical conditions. Doctors frequently assess fingernails to help diagnose different medical conditions. Common nail disorders that may indicate underlying health conditions include clubbing, which causes an extreme curve and rounding appearance to the fingernails, and concavity, where the nails bend up at the sides, making a U shape instead of a traditional C shape.
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They can indicate underlying health issues
The appearance of nails can indicate underlying health issues. Doctors frequently assess fingernails to help diagnose different medical conditions. For example, vitamin or mineral deficiencies can cause nails to become brittle, weak, and peel. A lack of vitamin A, vitamin D, or calcium can cause dryness and brittleness. A vitamin B12 deficiency may also cause nail discolouration.
Nail discolouration can also be indicative of underlying health issues. Bluish or purple fingernail beds may be a symptom of peripheral cyanosis, which indicates oxygen deprivation. Yellow nails may be caused by smoking, dark nail polish, or an infection. Yellow nail syndrome is a rare disorder that causes thick yellow nails and is usually accompanied by respiratory issues and limb swelling. Pale nails may indicate illnesses such as anaemia, congestive heart failure, or liver disease.
The shape of the nail can also be indicative of health issues. Clubbing, a condition where the nail curves and rounds, can be a sign of low oxygen levels, chronic lung disorders, or cardiovascular disease. Concavity, also known as koilonychia, occurs when the nails bend up at the sides, forming a U shape, and can be a sign of chronic iron deficiency. Spoon nails, a form of very thin nails, are also associated with iron deficiency anaemia.
Horizontal ridges, called Beau's lines, indicate a pause in nail growth and could be related to health issues such as high fever, vitamin deficiency, injury, diabetes, or peripheral vascular disease. Vertical ridges are usually harmless and age-related.
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Nails are linked to a vascular system
Nails are protective plates found at the tips of the fingers and toes of all primates, including humans. They 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, with the nail matrix being the active tissue that generates cells.
Nails are not dead, but they contain dead cells. They are linked to a richly vascular system in the fingertips, with various vascular networks in the nail periphery. These networks are derived from the dorsal collaterals arising from the palmar digital vessels and their arcades. The nail bed, in particular, has a dense vascular network with glomus bodies.
The colour of the nails is due to the visibility of the capillaries underneath, and healthy nails are typically pink at the nail beds. Nails can provide important clues about a person's health status, lifestyle, and even stress levels. For example, bluish or purple fingernail beds can indicate oxygen deprivation, while clubbing (an extreme curve and rounding of the fingernails) can be a sign of low oxygen levels or chronic lung disorders.
The main function of toenails is likely protection, while fingernails enhance grip and fine motor functions. Fingernails can assist in various tasks, such as opening things, scratching an itch, and picking up small objects. They also provide support and stability to the fingertips, preventing them from rolling backward when holding something.
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They have protective functions
Fingernails and toenails have protective functions. They are made of a tough, rigid protein called alpha-keratin, which also happens to be present in the claws, hooves, and horns of vertebrates. The keratin fibres in nails are packed closely together, making them dense and hard. This density and hardness make nails ideal for protecting the delicate soft tissues, nerves, blood vessels, and muscles underneath.
The protective function of nails is especially evident in the case of toenails. The tops of the toes are vulnerable to injury, and by having a protective nail on top, the chances of injury and infection are reduced. Footballers, for instance, may be grateful for their toenails, as they protect their toes from getting hurt while playing.
Nails also protect the fingertips from rolling backward when holding something. They provide a solid surface for the pads of the fingers to press against, enhancing grip and fine motor functions. This is particularly useful when performing manual tasks such as opening a can of Pringles or peeling an orange.
In addition to their protective functions, nails can also provide clues about a person's health status, nutrient deficiencies, lifestyle, and recreational habits. Certain nail disorders, such as clubbing and concavity, can indicate underlying health conditions like low oxygen levels or chronic iron deficiency.
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Frequently asked questions
Nails are protective plates that are found at the tip of the digits (fingers and toes) of all primates. They are made of a tough rigid protein called alpha-keratin, which is also found in the claws, hooves, and horns of vertebrates.
Nails help with fine motor skills, such as opening things, scratching an itch, and picking up tiny objects. They also help with grip by offering a solid surface for the pads of the fingers to press against when gripping something tightly. Toenails, in particular, can help prevent injury to the toes and may also assist in balance.
The formation of a nail begins inside a part of the fingertip called the nail root. This is where the cells that will eventually form the nail plate gradually die, harden, and push out of the skin. The older cells are compacted and pushed out by the formation of new cells, taking the form of the fingernail.
Yes, nails can provide clues about a person's health status, lifestyle, and recreational habits. For example, bluish or purple fingernail beds may indicate oxygen deprivation, while concavity or U-shaped nails may be a sign of chronic iron deficiency.
