Liam Carter
The lunula, or little moon in Latin, is the crescent-shaped white area at the base of a fingernail or toenail. It is a delicate part of the nail structure and can be used to assess one's health. The nail itself is a protective plate found at the tip of the fingers and toes of primates, made of a tough protein called alpha-keratin. Nails consist of the nail plate, the nail matrix, and the nail bed, with grooves surrounding them. Changes to the appearance of nails, such as deep grooves, colour changes, and lifting, can indicate underlying health issues and should be examined by a dermatologist.
| Characteristics | Values |
|---|---|
| Definition | Tiny longitudinal "grooves" called matrix crests (cristae matricis unguis) attach the epidermis to the dermis. |
| Location | The crest is located at the base of the nail underneath the skin. |
| Composition | The nail consists of the nail plate, the nail matrix, and the nail bed below it, and the grooves surrounding it. |
| Function | The crest helps to secure the nail plate to the nail bed, providing strength and flexibility to the nail. |
| Clinical Significance | The visibility of the crest increases with age as the nail plate thins, and it can be used as an indicator of distal tissue perfusion in dehydrated or shocked individuals. |
| Lunula | The lunula is a crescent-shaped whitish area at the base of the nail. It is a delicate part of the nail structure, and its absence or damage can indicate an underlying health issue. |
| Nail Changes | Dermatologists examine nail changes such as deep grooves (Beau lines), curving nails (clubbing), colour changes, nail lifting (onycholysis), and dark streaks (possible melanoma). |
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What You'll Learn
- The lunula is the crescent-shaped whitish area at the base of the nail
- Fingernail changes can indicate an underlying health problem
- Deep grooves that run the width of a nail may be a result of injury or illness
- A new or changing dark streak on a nail could be melanoma
- The nail plate is the hard, visible part of the nail
The lunula is the crescent-shaped whitish area at the base of the nail
The lunula plays a crucial role in defining the free edge of the distal nail plate, which is the outermost part of the nail that grows outward. It is the newest part of the nail, and its presence or absence can provide insights into one's health. For instance, the absence of the lunula may indicate underlying health issues. The lunula is formed by the nail matrix, which is the active tissue that generates cells. These cells harden as they move outward from the nail root to the nail plate.
The nail matrix, also known as the matrix unguis, is a highly innervated and sensitive part of the nail bed. It contains nerves, lymph, and blood vessels. The nail plate, on the other hand, does not contain any nerves or blood vessels. The nail plate, or the nail body, refers to the visible hard nail area from the nail root to the free edge. It is made of translucent keratin protein, specifically alpha-keratin, a tough, rigid polymer also found in claws, hooves, and horns of vertebrates.
The lunula is not the only part of the nail that can provide health clues. For example, deep grooves or gaps that run the width of the nail, known as Beau lines, can indicate a period of slowed or stopped nail growth due to factors such as fever, injury, chemotherapy, or major stress. Additionally, changes in the colour of the nail can be indicative of certain diseases, and dark streaks may, in some cases, indicate melanoma, the most serious type of skin cancer. Curved nails, known as clubbing, can also be a sign of an underlying health issue, although they can also be a harmless trait that runs in families.
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Fingernail changes can indicate an underlying health problem
White nails, or leukonychia, can be the result of trauma, anaemia, dietary deficiencies, heart or kidney disease, or poisoning. If the nails are mostly white with darker rims, this could be a sign of liver problems, such as hepatitis. Random white spots on nails are usually harmless and may occur due to an injury or frequent manicures. Other possible causes are zinc deficiency, a fungal infection, or an allergic reaction.
Yellow nails are common and may be caused by dark nail polish, smoking, or an infection. As the infection worsens, the nail bed may retract, and the nails may thicken, crumble, or detach from the nail bed. Dry, brittle nails that frequently crack or split have been linked to thyroid disease.
If your nails look "scooped out" like a spoon, you may have anaemia, hypothyroidism, or liver problems. Vertical ridges in your nails are usually age-related and harmless, whereas horizontal ridges, called Beau's lines, indicate a pause in nail growth that could be related to a health issue. Causes include high fever, vitamin deficiency, injury, diabetes, peripheral vascular disease, or chemotherapy.
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Deep grooves that run the width of a nail may be a result of injury or illness
Beau lines, or deep grooves that run the width of a nail, are usually harmless and are often a sign of a previous illness or injury. They are caused by a sudden interruption in nail growth, which can be due to various factors. For example, a single Beau line on one nail may indicate trauma or damage to a single digit, such as dropping something heavy or slamming your finger in a door. Beau lines can also be caused by a severe skin condition or manicure/artificial nails damaging the nail matrix, where nails start to grow.
In some cases, Beau lines may indicate a chronic condition or long-term health problem that interferes with blood flow to the nail matrix. Such conditions include peripheral artery disease (PAD) and Raynaud's phenomenon. Additionally, vitamin or nutrient deficiencies, such as a severe zinc deficiency or lack of protein, can interrupt nail growth and cause Beau lines.
Beau lines typically occur in multiple fingernails, usually all of them, and are horizontal depressions or grooves that run parallel to the white, moon-shaped portion of the nail bed (lunula) at the base of the nail. They are most commonly caused by a recent illness, injury, medical condition, severe stress, or certain medications that interrupt nail growth. When Beau lines are present in all nails at a similar location, it is likely due to a systemic cause, such as an illness or medication side effect.
If you notice Beau lines and are unsure of the cause, it is recommended to consult a healthcare professional to rule out any possible health conditions. Treating the underlying cause will allow new, smooth nails to grow again. There is no specific self-care required for Beau lines, and they will disappear as your nails grow, provided that the underlying cause has been addressed.
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A new or changing dark streak on a nail could be melanoma
Nail melanoma usually presents as a distinct dark line that runs vertically from the bottom to the top of the nail. This streak may start small but can grow over time, becoming wider and more irregular in shape. The discoloration can vary in shade, ranging from light brown to black, and may be thin or thick in appearance. In some cases, the nail may exhibit other signs of damage, such as splitting, cracking, or lifting away from the nail bed.
The most common symptom of nail melanoma is the presence of a dark streak, also known as longitudinal melanonychia. This dark streak is often the first sign to appear and can show up on any nail, although it typically affects the thumb or big toe of the dominant hand or foot. Longitudinal melanonychia is caused by an excess of melanocyte cells, which can lead to the formation of tumors or the destruction of surrounding tissue. While anyone can develop nail melanoma, older individuals and people with darker skin are at a higher risk. Additionally, a personal or family history of melanoma or previous nail trauma may also increase the likelihood of developing nail melanoma.
If you notice any new or changing dark streaks on your nails, it is important to consult a healthcare professional, such as a dermatologist, as soon as possible. Dermatologists are medical doctors who specialize in treating the skin, hair, and nails, and they can help determine the underlying cause of any nail changes. While nail melanoma is a serious condition, early detection and prompt treatment lead to the best outcomes. By regularly examining your nails and seeking medical advice when necessary, you can take a proactive approach to your health and well-being.
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The nail plate is the hard, visible part of the nail
The nail plate, also known as the corpus unguis or nail body, is the hard, visible part of the nail. It is made of translucent keratin, a tough, rigid protein. The nail plate is about half a millimeter thick and slightly curved. It is attached to the nail bed, which is the skin beneath it, and the two are separated at the tip of the finger or toe. The nail plate is formed from the nail matrix, the active tissue that generates cells. The cells harden as they move outward from the nail root to the nail plate.
The nail plate is made up of several layers of dead, compacted cells, which give it strength and flexibility. Its shape is determined by the form of the underlying bone. The word "nail" often refers only to the nail plate in common usage. The nail plate does not contain any nerves or blood vessels. However, the nail bed, which the nail plate is attached to, is highly innervated, and removing the nail plate can be extremely painful.
The nail plate is framed by the lateral nail folds on its left and right sides. The skin bordering the lower end of the nail plate is called the proximal nail fold, and a thin layer of skin, known as the cuticle, grows over the nail there. The cuticle is a semi-circular layer of almost invisible dead skin cells that cover the back of the nail plate. Together with the eponychium, the cuticle forms a protective seal. The eponychium is the fold of skin cells that produces the cuticle, and it is considered a living part of the nail, unlike the cuticle.
The lunula, or "small moon," is the whitish, crescent-shaped base of the visible nail. It is the visible part of the matrix, where the nail matrix and nail bed meet. The lunula appears white due to the reflection of light at this point. The nail matrix is located beneath the proximal nail fold and the nail plate, and it is responsible for the formation of the hard nail plate.
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Frequently asked questions
The lunula is a crescent-shaped whitish area at the base of the nail bed. It is located at the end of the nail that is closest to the skin of the finger, and it appears by week 14 of gestation.
The lunula has a primary structural role in defining the free edge of the distal nail plate, which is the part of the nail that grows outward. It is a delicate part of the nail structure and can be permanently damaged if not cared for properly.
The lunula is located on the newest part of the nail, which allows assessments to be made about one's health. For example, its absence may indicate an underlying health problem.
