Liam Carter
The human nail is a protective plate found at the tip of the fingers and toes, corresponding to claws in other animals. The average human fingernail grows at a rate of about 3-3.5mm per month, while toenails grow at about half that speed. 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 consists of the nail plate, the nail matrix, and the nail bed below it. The nail matrix is the active tissue that generates cells, which harden as they move outward from the nail root to the nail plate. The nail bed is the skin beneath the nail plate, made of two types of tissues: the dermis and the epidermis. The health of your nails can reveal clues about your overall health, with changes in colour or texture potentially indicating disease elsewhere in the body.
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What You'll Learn
- Fingernails are made of alpha-keratin, a protein also found in claws, hooves and horns
- The nail plate, matrix and bed are the three main parts of a nail
- The lunula is the white, crescent-shaped base of the nail
- Nail growth rate depends on age, sex, diet, exercise and hereditary factors
- Nail abnormalities can indicate health issues like psoriasis, endocarditis, or nail melanoma
Fingernails are made of alpha-keratin, a protein also found in claws, hooves and horns
Fingernails are made of a tough, rigid protein called alpha-keratin, which is also found in claws, hooves, and horns. This protein is a polymer that forms the structure of nails, providing strength and protection. The nail, or "nail plate," is the visible part of the nail unit, which also includes the nail matrix and the nail bed below it. The nail matrix is the active tissue that generates new cells, constantly producing keratin, which gathers at the nail plate and pushes the nail forward, causing it to grow. The growth rate of nails is related to the length of the terminal phalanges (outermost finger bones), with the index finger's nail growing faster than that of the little finger.
The nail bed is the skin beneath the nail plate, and it is highly innervated, making the removal of the nail plate painful. The nail bed is made up of two types of tissues: the dermis and the epidermis. The epidermis attaches to the dermis through tiny longitudinal grooves called matrix crests. The lunula, or "small moon," is the whitish, crescent-shaped base of the nail, where the nail matrix and nail bed meet. This area can be seen most clearly in the thumb.
Nails have important functions, such as aiding in locomotion and providing a sense of touch. They also offer protection to the tips of our fingers and toes. The health of our nails can provide clues about our overall health, with changes in colour or texture sometimes indicating underlying conditions. For example, white nails may indicate conditions such as trauma, anemia, or liver problems, while yellow nails are commonly caused by fungal infections.
Nail care is important to maintain their health and appearance. Regular trimming and filing can help prevent nails from becoming too rough and remove bumps that may cause tangling. Nails can also dry out, peel, break, and become infected, so proper care and hygiene are essential. Additionally, nails should not be used as tools, as this can cause trauma and increase the risk of infection.
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The nail plate, matrix and bed are the three main parts of a nail
The nail plate, matrix, and bed are the three main parts of a nail. The nail plate, also known as the corpus unguis or nail body, is the hard, outer portion of the nail unit. It is made of a translucent, keratin protein, which is a tough, rigid polymer also found in the claws, hooves, and horns of vertebrates. The nail plate is about half a millimeter thick and is slightly curved. It is formed by layers of dead, compacted cells that cause the nail to be strong yet flexible. The width, thickness, and shape of the nail plate are determined by the size, length, and thickness of the matrix, as well as the shape of the fingertip bone.
The nail matrix, or germinal matrix, is the area of soft tissue located beneath the nail plate that generates new cells. These cells harden as they move outward from the nail root to the nail plate, pushing the nail forward and causing it to grow. The matrix will continue to produce cells as long as it receives nutrition and remains healthy. The lunula, or "small moon," is the visible part of the matrix, appearing as a whitish, crescent-shaped base of the nail.
The nail bed is the skin beneath the nail plate, to which the plate is strongly attached. It is made of two types of tissues: the dermis and the epidermis, which are attached by tiny longitudinal "grooves" called matrix crests. The nail bed provides a smooth surface for the growing nail plate to slide over. Nerves and blood vessels in the nail bed supply nourishment to the entire nail unit. The nail bed is highly innervated, which is why removal of the nail plate can be extremely painful.
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The lunula is the white, crescent-shaped base of the nail
The lunula has a primary structural role in defining the free edge of the distal nail plate. It is the visible portion of the distal nail matrix that extends beyond the proximal nailfold. Lunular anomalies include changes in form and structure, as well as colour. For example, in 26 cases studied, the lunula was discoloured; it was red in 22 cases, blue in 3, and was part of a longitudinal leukonychia in one. Alterations in the morphologic features or colour of the lunula can be an indication of either a cutaneous or a systemic disorder.
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. The nail matrix is also known as the matrix unguis, keratogenous membrane, or onychostroma. It is the part of the nail bed that is beneath the nail and contains nerves, lymph, and blood vessels. The matrix produces cells that become the nail plate.
The lunula's location on the newest part of the nail allows assessments to be made about one's health. In some cases, its absence may indicate an underlying health problem.
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Nail growth rate depends on age, sex, diet, exercise and hereditary factors
Fingernails and toenails are made of a tough, rigid protein called alpha-keratin, which is also found in the claws, hooves, and horns of vertebrates. The average growth rate of fingernails is about 3.5 mm per month, while toenails grow at about half that rate, at approximately 1.6 mm per month. However, it's important to note that nail growth rates vary depending on several factors, including age, sex, diet, exercise, and hereditary factors.
Age plays a significant role in nail growth, with younger individuals generally experiencing faster nail growth compared to older adults. For example, a study by Dr. William Bean found that his left thumbnail grew at a rate of 0.123 mm per day when he was 23 years old, but by the time he was 67, this rate had slowed to 0.095 mm per day. This decrease in nail growth with age may be attributed to the slowing of blood circulation as we get older.
Sex or gender also influences nail growth rates, with males typically having faster-growing nails than females. This difference may be related to hormonal variations between the sexes. For instance, during pregnancy, nails have been observed to grow more rapidly, while lactation may lead to slower nail growth. Puberty is another period when hormone levels fluctuate, and it is believed that nail growth peaks during this time before gradually declining as hormone levels stabilize.
Diet and exercise habits can also impact nail growth. A well-balanced diet that provides the necessary nutrients for nail health can promote stronger and possibly faster-growing nails. Additionally, certain physical activities or exercises that increase circulation in the hands and feet may stimulate nail growth. However, aggressive exercises such as long-distance running can have the opposite effect, making nails more susceptible to damage or infection.
Lastly, hereditary factors, including the length of the terminal phalanges (outermost finger bones), influence nail growth rates. Individuals with longer fingers tend to have faster-growing nails. Additionally, the growth rate of each finger nail varies, with the index finger nail typically growing faster than the little finger nail. These variations in growth rates between different fingers may be related to evolutionary advantages for grasping and manipulation.
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Nail abnormalities can indicate health issues like psoriasis, endocarditis, or nail melanoma
The nails on our fingers and toes are made of a tough, rigid protein called alpha-keratin, which is also found in the claws, hooves, and horns of vertebrates. The nail has several components: the nail plate, the nail matrix, the nail bed, and the grooves surrounding it. The nail matrix is the active tissue that generates cells, which harden as they move outward from the nail root to the nail plate. The nail bed is the skin beneath the nail plate, made up of two types of tissues: the dermis and the epidermis. Nerves and blood vessels in the nail bed nourish the entire nail unit.
Nail abnormalities can indicate underlying health issues. For example, clubbing of the nails can suggest pulmonary disease, inflammatory bowel disease, or neoplastic diseases, particularly those of the lung and pleura. Koilonychia, or "spoon-shaped" nails, may indicate hemochromatosis or anemia. Beau's lines may indicate previous severe illness, trauma, or exposure to cold temperatures in patients with Raynaud's disease. Muehrcke's lines indicate low albumin levels. Splinter hemorrhages, or thin, longitudinal red or brown lines beneath the nail plate, can be a sign of endocarditis, psoriasis, lichen planus, vasculitis, lupus, melanoma, or a localized fungal infection. Melanoma, a type of skin cancer, may appear as a dark streak down the length of the nail. Nail changes can also result from nutritional deficiencies, vitamin deficiencies, infections, thyroid disease, nail bed tumors, medication use, or cosmetic products.
While most nail changes are benign, some abnormalities could indicate a more serious medical problem. Therefore, it is important to be vigilant about any changes in nail shape, texture, or color and to consult a doctor or dermatologist if concerns arise.
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Frequently asked questions
Fingernails are made of a tough, rigid protein called alpha-keratin, a polymer also found in the claws, hooves, and horns of vertebrates.
A fingernail 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 that generates cells, which harden as they move outward from the nail root to the nail plate.
Fingernails grow at a rate of about 3-3.5 mm per month, while toenails grow at about half that speed. The actual growth rate depends on several factors, including age, sex, season, exercise level, diet, and hereditary factors.
Some common fingernail problems include rough, splitting, or brittle nails, which can be caused by repeated wetting and drying of the nails or a deficiency in iron or zinc. Ridges on fingernails can also be a cause for concern, especially horizontal ridges (Beau's lines), which may indicate kidney disease or another underlying condition.
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