Isla Bennett
Fingernails are made of a tough, rigid protein called alpha-keratin, which is also found in hair, as well as in the claws, hooves, and horns of other vertebrates. The nail itself is known as the nail plate, and it is made up of three layers of keratin cells that are no longer living. As the nail matrix (or matrix unguis) produces new keratin, it gathers at the nail plate and pushes the nail forward, causing it to grow. The nail bed, which contains blood vessels, nerves, and melanocytes that produce melanin, is the skin beneath the nail plate. It provides nourishment to the nail unit and helps it to grow smoothly and properly.
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What You'll Learn
- The nail plate, made of translucent keratin protein, is the hard, visible part of the nail
- The nail matrix, or germinal matrix, is the part of the nail bed that produces cells that become the nail plate
- The nail bed is the skin beneath the nail plate that contains blood vessels, nerves, and melanocytes that produce melanin
- The lunula is the whitish, crescent-shaped base of the nail, where the nail matrix and nail bed meet
- Fingernails grow at a rate of about 3mm per month, and their growth can be impacted by factors like season, health, and stress
The nail plate, made of translucent keratin protein, is the hard, visible part of the nail
The nail plate, or the nail body, is the hard, outer part of the nail that we see. It is made of translucent keratin protein, which is a type of tissue with amino acid proteins. Keratin is a water-insoluble protein that is also found in our hair and nails, as well as in other animals, including horse hooves.
The nail plate is made up of several layers of dead, compacted cells, which give it strength and flexibility. The shape of the nail plate is determined by the underlying bone, and the width and thickness are determined by the size, length, and thickness of the matrix. The matrix, or the germinal matrix, is the part of the nail bed that lies beneath the nail plate and contains nerves, lymph, and blood vessels. It produces the cells that become the nail plate.
As new nail plate cells are formed, they push older cells forward, causing them to become compressed, flat, and translucent. This compression of cells is what gives the nail its hardness and strength. The capillaries in the nail bed below become visible through the translucent nail plate, resulting in a pink colour.
The nail plate is firmly attached to the nail bed, which is the skin beneath it. The nail bed does not contain any nerves or blood vessels, but it is highly innervated, which is why removing the nail plate can be extremely painful. The nail bed is made up of two types of tissues: the dermis and the epidermis.
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The nail matrix, or germinal matrix, is the part of the nail bed that produces cells that become the nail plate
The nail matrix is located at the base of the nail and is responsible for creating new cells that allow the nail to grow. The width and thickness of the nail plate are determined by the size, length, and thickness of the matrix. The shape of the fingertip bone determines whether the nail plate is flat, arched, or hooked. The matrix will continue to produce cells as long as it remains healthy and receives nutrition.
The lunula, a whitish, crescent-shaped area at the base of the nail plate, is the only visible part of the nail matrix. However, some people may not have a visible lunula, which is entirely normal. The lunula appears white due to the reflection of light where the nail matrix and nail bed meet. The dermal capillary is responsible for the pink colour of the nail plate.
The nail matrix has two parts: the germinal matrix and the sterile matrix. The germinal matrix is located under the base of the nail, while the sterile matrix lies underneath. About 90% of nail growth comes from the germinal matrix, which gives a natural curvature to the nail. The sterile matrix is responsible for the remaining 10% of cells that make up the nails and is crucial for keeping the nail attached to the underlying skin.
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The nail bed is the skin beneath the nail plate that contains blood vessels, nerves, and melanocytes that produce melanin
The nail bed is the skin beneath the nail plate. It is the area of the nail on which the nail plate rests and acts as a foundation for the nail plate. The nail bed is made up of two structures: the nail bed epithelium and the underlying dermis. The nail bed epithelium is a type of epithelial tissue that attaches itself to the underside of the nail plate, holding it in place. The dermis layer of the nail bed contains blood vessels, nerves, and melanocytes that produce melanin. These blood vessels supply food, oxygen, and nutrients to the fingernail, keeping it healthy and moisturised.
The nail bed is highly innervated, which means it is very sensitive to pain. This is why removing the nail plate or cutting your nails too short can be extremely painful. The nail bed is also susceptible to damage and infection if not properly cared for. Biting your nails can leave the nail bed tissue exposed, leading to possible health complications such as inflammation.
The nail bed is an important part of the nail anatomy, working together with the nail plate to support the overall function and appearance of the nails. The nail plate, made of densely packed keratin cells, serves as protection for the living nail bed beneath. The nail plate is translucent, and the pink appearance we typically associate with fingernails comes from the blood vessels underneath in the nail bed.
The nail bed is also connected to the nail matrix, which is the active tissue that generates cells that become the nail plate. The nail matrix is sometimes visible as the lunula, a whitish crescent shape at the base of the nail. The width and thickness of the nail plate are determined by the size, length, and thickness of the matrix, while the shape of the fingertip bone determines whether the nail plate is flat, arched, or hooked.
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The lunula is the whitish, crescent-shaped base of the nail, where the nail matrix and nail bed meet
The lunula is the whitish, crescent-shaped base of the fingernail, where the nail matrix and nail bed meet. The word 'lunula' means 'small moon' in Latin, referring to the white, half-moon shape at the base of the nail. This part of the nail is also known as the 'half-moon'. Not everyone has a visible lunula, and its size can vary across each nail, with the lunula typically being most noticeable on the thumb and least visible on the little finger. The lunula is the visible portion of the distal nail matrix, which produces the cells that become the nail plate. The nail plate, or nail body, is the hard, outer part of the nail that is visible to us.
The lunula appears white due to the reflection of light where the nail matrix and nail bed meet. The nail bed is the skin beneath the nail plate, to which it is strongly attached. The nail bed contains nerves and blood vessels that supply nourishment to the entire nail unit. The nail matrix, or tissue just beneath the nail, also contains nerves, lymph, and blood vessels, and it is responsible for producing the cells that become the nail plate. As new nail plate cells are made, they push older cells forward, and these older cells become compressed, flat, and translucent, allowing the capillaries in the nail bed below to be visible, resulting in a pink colour.
The lunula's location on the newest part of the nail means that its appearance can be used to assess one's health. For example, a receded lunula can be an indicator of shock states such as hypovolemia, and a red lunula may signal heart failure. In some cases, the absence of a lunula may indicate an underlying health problem. The appearance of the lunula can also be affected by external factors, such as the use of certain medications or the consumption of too much fluoride.
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Fingernails grow at a rate of about 3mm per month, and their growth can be impacted by factors like season, health, and stress
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, as well as the grooves surrounding it. The nail plate, or nail body, is the visible hard nail area from the nail root to the free edge. It is made of several layers of dead, compacted cells of translucent keratin protein, which make the nail strong but flexible. The shape of the nail plate is determined by the form of the underlying bone.
Fingernails grow at a rate of about 3mm per month, or about 0.1mm per day. However, this rate can vary depending on several factors. Firstly, the nails on the dominant hand tend to grow faster, possibly due to more frequent use, which can lead to trauma and an increased risk of injury. This trauma stimulates circulation in the nail bed, which may result in quicker nail growth. Additionally, longer fingers tend to have faster-growing nails. The little finger tends to have the slowest nail growth rate, while the thumb has the fastest.
Age also plays a role in nail growth, with older individuals experiencing slower nail growth, possibly due to the increased prevalence of health conditions that can impact nail growth, such as fungal infections. Overall health and certain health conditions can also influence nail growth, with immunocompromised, paralyzed, malnourished, or infected individuals experiencing slower nail growth. Hormone levels and fluctuations can also be a factor. For example, low albumin levels, an essential protein that helps maintain fluid balance and transport substances in the body, may be indicated by lines on the nails.
Environmental factors, such as the season, can impact nail growth. Nails tend to grow faster during the summer and slower during the winter, although the reason for this is not yet well understood. Stress may also be a factor, as it has been associated with slower nail growth or even a temporary halt in growth.
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Frequently asked questions
Nails are made of a tough, rigid protein called alpha-keratin, a polymer also found in the claws, hooves, and horns of vertebrates.
The nail matrix (or matrix unguis) is the active tissue that generates cells. These cells harden as they move outward from the nail root to the nail plate, causing the nail to grow.
Fingernails serve a number of functions, including enhancing grip, scratching, grooming, and self-defense. They also protect against infections and improve sensation and dexterity.
Nail changes can indicate underlying medical problems. For example, yellow nails can be a sign of a respiratory condition, thyroid issue, psoriasis, diabetes, or liver or kidney problems. Clubbed nails can indicate low oxygen levels in the blood and may be related to lung, heart, or liver disease.
