Liam Carter
Fingernails are a type of skin appendage, made of skin cells, that serve as a protective shield at the tips of our fingers and toes. 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 fingernails is to protect the fingertips from injuries and infections, but they also enhance sensation and precise movements of the fingers, and act as tools.
| Characteristics | Values |
|---|---|
| Material | Alpha-keratin, a tough, rigid protein |
| Parts | Nail root, nail plate, free margin, nail bed, cuticle, nail fold |
| Function | Protect fingertips, enhance sensation and movement, act as tools |
| Growth | Fingernails: 3-3.47mm/month; Toenails: 1.62mm/month |
| Blood flow | Fingernails have greater blood flow than toenails |
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What You'll Learn
Fingernails protect the fingertips
Fingernails are a protective plate that covers the fingertips. They are made of a tough, rigid protein called alpha-keratin, which is also found in the claws, hooves, and horns of vertebrates. The nails themselves are not living, which is why they can be trimmed without pain. However, the nail bed beneath the nail is highly innervated, and removing the nail plate can be extremely painful.
The primary function of fingernails is to protect the soft tissues of the fingertips from injuries. They act as a protective shield, defending the sensitive fingertip from damage during everyday tasks. The tough, rigid structure of the nail plate safeguards the underlying skin and tissues, allowing us to perform various activities without worrying about injuring our fingertips.
Fingernails also enhance our sense of touch and improve our ability to feel pressure and handle objects. They increase the sensitivity of the fingertips by exerting counter-pressure on the pulp of the finger. This helps us perform precise and delicate movements, such as picking up small items or separating pages in a book.
Additionally, fingernails act as tools, enabling us to perform tasks that require fine precision grip, such as pulling out a splinter or cutting and scraping actions. They also help prevent the entry of viruses and bacteria into the body, providing an extra layer of defence against potential pathogens.
The health of our fingernails can also provide important clues about our overall health. Doctors often assess fingernails to help diagnose different medical conditions, as certain nail disorders can indicate underlying health issues, including nutritional deficiencies. Therefore, maintaining healthy fingernails is crucial not only for their functional benefits but also as a potential indicator of our general well-being.
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They aid sensation and precise movement
Fingernails are composed of three layers of tissue called keratin, a fibrous protein that gives nails their rigid structure. They are protective plates that cover the fingertips, corresponding to the claws in other tetrapod animals. The nails themselves do not have nerve endings, but they aid in sensation and precise movement.
The nails aid sensation and precise movement through the counter-pressure exerted on the pulp of the fingers. When the fingertip touches an object, the nail acts as a counter-force, enhancing the sensitivity of the fingertip. This helps to keep the fingertips from rolling backward when holding something. The strength and existence of fingernails are essential for this purpose.
Fingernails also improve fine motor skills and the ability to scratch and separate things, such as book pages or hairs on the head. They can also be used to pick up items and perform tasks such as pulling out a splinter, cutting, or scraping. The nails' hardness and rigidity, provided by the keratin layers, make them effective tools for these precise movements.
Additionally, the shape and condition of fingernails can provide clues about overall health. Healthcare providers often examine fingernails to assess oxygen saturation and blood flow. The colour of the nail bed, which is pink due to the presence of capillaries, can indicate normal blood flow. If the nail beds are bluish or purple, it may signify low oxygen saturation. The growth rate of fingernails can also be influenced by factors such as age, sex, and season.
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They act as tools
Fingernails are composed of three layers of tissue called keratin, a fibrous protein also found in our hair and nails. The three main parts of a nail are the nail root, the nail plate, and the free margin. The nail plate is the visible part of the nail, and the free margin is the portion of the nail that protrudes beyond the distal end of the finger or toe.
The nail acts as a tool in several ways. Firstly, it enables an extended precision grip, similar to tweezers, allowing us to pick up small objects. This grip is made possible by the counter-pressure exerted on the pulp of the finger by the nails, enhancing our ability to handle objects. Secondly, the nail functions as a tool for cutting and scraping actions. For example, we can use our fingernails to scratch an itch, separate pages in a book, or even pull out a splinter in our finger.
The strength and existence of fingernails also help prevent our fingertips from rolling backward when we hold something, further enhancing our grip and ability to handle objects. Additionally, the nail plate, being slightly curved and about 1 millimeter thick, provides a protective shield for the soft tissues and fingertips, defending against injuries and infections.
The nail's tool-like functions are not limited to physical tasks. The colour of the nail bed can be used as a diagnostic tool, providing a quick assessment of oxygen saturation and blood flow in a patient. Healthcare providers, especially EMTs, may examine the fingernail beds for this purpose. If the nail beds appear bluish or purple, it generally indicates low oxygen saturation.
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They prevent infection
The human nail is a protective plate found at the tip of the digits (fingers and toes) of all primates, corresponding to the claws in other tetrapod animals. The nail plate, the visible part of the nail, is made of skin cells called onychocytes (a type of keratinocyte) that produce keratin. Keratin is a fibrous protein that gives nails their rigid structure.
The cuticle, a layer of dead epithelial cells that overlaps and covers the edge of the nail plate, helps to seal the edges of the nail to prevent infection of the underlying tissues. The cuticle is the semi-circular layer of almost invisible dead skin cells that "ride out on" and cover the back of the visible nail plate. Together with the eponychium, the cuticle forms a protective seal.
The hyponychium, located beneath the nail plate at the junction between the free edge and the skin of the fingertip, forms a seal that protects the nail bed. The onychodermal band is the seal between the nail plate and the hyponychium. It is just under the free edge, in that portion of the nail where the nail bed ends.
The nail bed is the skin beneath the nail plate. It is the area of the nail on which the nail plate rests. Nerves and blood vessels found here supply nourishment to the entire nail unit. The nail bed is highly innervated, and removal of the nail plate is often excruciatingly painful as a result.
Fingernails also prevent viruses and bacteria from entering the body. If a person’s nail bed is disrupted, they may be more at risk for nail infections.
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They are indicators of health
Fingernails are made of a tough, rigid protein called alpha-keratin, a polymer also found in the claws, hooves, and horns of vertebrates. They are protective plates that cover the soft tips of the fingers and toes, corresponding to the claws in other tetrapod animals. The nails act as a tool to help you scratch, improve your sense of touch, and handle objects.
The health of your fingernails can indicate potential underlying problems, such as nutritional deficiencies. For example, a lack of vitamin A, vitamin D, or calcium can cause dryness and brittleness. Deformities in the nails can also be a sign of potential health issues. Doctors frequently assess fingernails to help diagnose different medical conditions. Common nail disorders that may indicate underlying health conditions include clubbing.
The colour of the nail bed can be used to quickly assess oxygen and blood flow in a patient. If the nail beds are bluish or purple, it is generally a sign of low oxygen saturation. A blanch test can be done to see if blood flow to the extremities is adequate. In this test, a fingernail is briefly depressed to turn the nail bed white by forcing the blood out of its capillaries. When the pressure is released, the pink colour of the nail bed should return within a second or two if there is normal blood flow.
Fingernails grow about 3 millimeters every month, with toenails growing slightly slower. Fingernails grow faster than toenails, with the big toenail being the fastest-growing nail on the feet, and the pinky fingernail being the slowest-growing fingernail. The rate of nail growth depends on factors such as age, sex, and season.
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Frequently asked questions
Fingernails are a type of skin appendage, made of skin cells. They are hard, protective coverings over the soft tips of the fingers.
Fingernails are made of a tough, rigid protein called alpha-keratin, a polymer also found in the claws, hooves, and horns of vertebrates.
Fingernails have several functions. They protect the fingertips from injuries, enhance sensation and precise movements, and act as tools. They also help prevent viruses and bacteria from entering the body.
Fingernails grow about 3 millimeters every month. If you damage or lose a fingernail, it can take four to six months to grow back.
