Ava Monroe
The nail matrix is the structure responsible for nail growth. It is the active tissue (or germinal matrix) that generates cells, which harden as they move outward from the nail root to the nail plate. The matrix lies beneath the skin, at the inner edge of the nail plate, and is responsible for most of a nail's growth. It constantly produces new keratin that gathers at the nail plate and slowly pushes the nail forward, causing it to grow. The nail bed, or sterile matrix, extends from the edge of the nail root, or lunula, to the tissue known as the hyponychium. While the nail matrix is responsible for about 90% of nail growth, the nail bed accounts for the remaining 10% of cells that make up the nail.
| Characteristics | Values |
|---|---|
| Structure responsible for nail growth | Nail matrix (also known as the matrix unguis, keratogenous membrane, or onychostroma) |
| Location of nail matrix | Underneath the nail, at the base of the nail |
| Nail matrix composition | Nerves, lymph, and blood vessels |
| Nail matrix function | Constantly produces new keratin that gathers at the nail plate and slowly pushes the nail forward, causing it to grow |
| Average monthly fingernail growth rate | 3mm-3.5mm |
| Average monthly toenail growth rate | 1.6mm |
| Time taken for complete fingernail regrowth | 3-6 months |
| Time taken for complete toenail regrowth | 12-18 months |
| Factors influencing growth rate | Age, sex, season, exercise level, diet, and hereditary factors |
| Nail appearance changes indicating nail matrix problems | Bruising, ridges, discolouration, Beau's lines, pitting, texture changes, etc. |
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What You'll Learn
The matrix is responsible for nail growth
The matrix is the actively growing tissue that lies beneath the skin at the inner edge of the nail plate. It is responsible for most of a nail's growth, as new cells grow here and advance forward to form the nail until it reaches the outer edge. The matrix produces new keratin that gathers at the nail plate and slowly pushes the nail forward, causing it to grow. This is how the nail plate, or the visible hard nail area, is formed.
The nail matrix is also known as the matrix unguis, keratogenous membrane, or onychostroma. It is the only living part of a nail and is the part of the nail bed that is beneath the nail. The nail bed is also referred to as the sterile matrix, which extends from the edge of the nail root or lunula to the tissue known as the hyponychium. The nail bed contains blood vessels, nerves, and melanocytes that produce melanin. As the root grows, the nail streams down along the nail bed, adding material to the underside of the nail to make it thicker.
The matrix is constantly producing new cells that harden as they move outward from the nail root to the nail plate. About 90% of nail growth comes from the germinal matrix, with the remaining 10% from the sterile matrix, which is more important for keeping the nail attached to the underlying skin. The nail itself, the underlying structure that supports nail growth, and the surrounding skin tissue make up the three main parts of nail anatomy.
Injuries and certain health conditions can damage the nail matrix and interfere with nail growth. For example, peripheral artery disease causes reduced blood flow to the legs and feet, which can affect the nail matrix and slow nail growth. Severe eczema can also affect the nail matrix and temporarily interfere with nail growth, resulting in Beau's lines, pitting, and texture or colour changes. Chemotherapy and other medications can also affect the nail matrix, causing Beau's lines or slow nail growth.
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Germinal matrix generates 90% of nail cells
The nail matrix is the structure responsible for nail growth. It comprises two parts: the germinal matrix and the sterile matrix. The germinal matrix, located under the base of the nail, produces about 90% of nail cells. The remaining 10% of cells are formed by the sterile matrix, which lies underneath the nail.
The nail matrix is made of special cells that generate new fingernails or toenails. Each nail matrix produces 196 layers of cells that combine to form each nail. The cells within the germinal matrix divide and become keratinised to form the nail plate. This continuous cell division within the matrix 'pushes' the nail plate over the nail bed as it matures. The nail bed, or sterile matrix, provides a smooth surface for the growing nail plate to slide over.
The germinal matrix is the only visible part of the nail matrix, appearing as a white crescent shape, or lunula, at the base of the nail. Some people do not have visible lunulas, which is normal. The lunula is part of the nail's overall structure, which also includes the cuticle, lateral nail fold, nail plate, nail bed, and proximal nail fold.
Injuries and certain health conditions can damage the nail matrix and interfere with nail growth. Minor damage can cause temporary changes in the nail's appearance, such as ridges or discolouration. Severe injuries can cause the nail to fall off, and in cases of significant nail matrix damage, the nail may not grow back.
Nail growth can also be affected by various health conditions and illnesses. For example, peripheral artery disease reduces blood flow to the legs and feet, slowing nail growth. Certain skin conditions, such as severe eczema, can also interfere with nail growth, leading to Beau's lines, pitting, and texture or colour changes. Additionally, medications can impact the nail matrix, causing Beau's lines or slow nail growth.
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Sterile matrix keeps the nail attached to the skin
The nail unit is a complex structure with two main functions: protection and sensation. The nail itself is divided into three main parts: the nail, the underlying structure that supports nail growth, and the skin tissue that surrounds it. The nail plate, or nail body, is the hard nail area made of translucent keratin protein. The nail matrix is the actively growing tissue below the nail plate, also known as the matrix unguis, keratogenous membrane, or onychostroma. The nail bed, or sterile matrix, lies underneath the nail plate, attaching it to the distal phalanx.
The nail matrix is responsible for most of a nail's growth. It produces new cells that move outward from the nail root to the nail plate, forming the nail until it reaches the outer edge. The nail matrix can be divided into two parts: the germinal matrix and the sterile matrix. The germinal matrix generates around 90% of nail growth, while the sterile matrix is responsible for the remaining 10% of cells that make up the nails.
The sterile matrix, also known as the nail bed, plays a crucial role in keeping the nail attached to the underlying skin. It provides a smooth surface for the growing nail plate to slide over. The nail bed contains blood vessels, nerves, and melanocytes that produce melanin. As the root grows, the nail streams down along the nail bed, adding material to the underside of the nail to make it thicker. When the nail grows properly, the nail bed is smooth, but improper nail growth can cause the nail to split or develop ridges.
Injuries and certain health conditions can damage the nail matrix, including the sterile matrix, and interfere with nail growth. Minor damage to the nail matrix can cause temporary changes in the nail's appearance, such as bruising, ridges, or discoloration. In severe cases, the nail may fall off. Peripheral artery disease (PAD), for example, reduces blood flow to the legs and feet, affecting the nail matrix and slowing nail growth. Skin conditions such as severe eczema can also interfere with nail growth, leading to Beau's lines, pitting, and texture or colour changes.
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Nail bed supplies the nail plate with nutrients
The nail plate, often referred to as "the nail", is the visible, hard part of the nail. It is made of translucent, compacted keratin cells. This structure gives the nail its strength and flexibility. The pinkish appearance of the nail plate comes from the blood vessels that lie underneath it. The underside of the nail plate features grooves that help anchor it to the nail bed.
The nail bed is the skin beneath the nail plate. It is the area where the nail plate rests. The nail bed contains nerves and blood vessels that supply nourishment to the entire nail unit. The nail bed is highly innervated, and the removal of the nail plate can be excruciatingly painful. The nail bed is also referred to as the sterile matrix. It extends from the edge of the nail root or lunula to the tissue known as the hyponychium.
The nail matrix is the actively growing tissue 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 lies beneath the nail and contains nerves, lymph, and blood vessels. The matrix produces cells that become the nail plate. The nail matrix is responsible for about 90% of nail growth. It is the only living part of a nail.
The nail plate is strongly attached to the underlying, richly vascularized nail bed, which supplies the plate with necessary nutrients. The cells at the front edge of the nail plate die and turn white as they lose contact with the nail bed. The whitish, crescent-moon-shaped part of the nail, known as the lunula, is also not attached to the underlying nail bed. The lunula is the growing part of the nail, located under the skin at the nail's proximal end under the epidermis.
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Conditions like eczema can slow nail growth
The nail matrix, which lies beneath the skin at the inner edge of the nail plate, is responsible for most nail growth. It is where new cells grow and then move forward to form the nail. The nail matrix has two parts: the germinal matrix, which is responsible for 90% of nail growth, and the sterile matrix, which is responsible for the remaining 10% of cells and keeps the nail attached to the underlying skin.
Injuries and certain health conditions can damage the nail matrix and interfere with nail growth. For example, a serious illness such as a heart attack, COVID-19, or pneumonia can interrupt nail growth and cause Beau's lines (horizontal ridges in the nails). Chemotherapy and other medications can also cause Beau's lines and slow nail growth.
Skin conditions and diseases can also affect the nail matrix and slow nail growth. Severe eczema can cause Beau's lines, pitting (small pinhole-like dots), and texture or colour changes. It can also cause nail deformity and crumbling nails. Pompholyx eczema can affect the nail folds and skin around the nails (cuticles), resulting in swelling. Nail eczema is usually treated with a combination of lifestyle changes, such as avoiding triggering products and keeping hands dry, and medications such as topical steroids.
Nail psoriasis can also cause changes to the nails, including white lines, pitting, and crumbling. Up to 80% of people with psoriasis develop nail psoriasis. Other dermatological diseases that can affect the nails include lichen planus, lichen nitidus, pityriasis rubra pilaris, alopecia areata, and Darier's disease.
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Frequently asked questions
The nail matrix, also known as the matrix unguis, keratogenous membrane, or onychostroma, is the active tissue that generates cells and is responsible for nail growth.
The nail matrix is the part of the nail bed that lies beneath the nail and contains nerves, lymph, and blood vessels.
The nail matrix produces new keratin that gathers at the nail plate and slowly pushes the nail forward, causing it to grow.
About 90% of nail growth comes from the germinal matrix, while the remaining 10% is contributed by the sterile matrix, which is also crucial for keeping the nail attached to the underlying skin.
Yes, the nail matrix can be injured or damaged due to various factors, including accidents, health conditions, and skin diseases. Damage to the nail matrix can cause bruising, ridges, discolouration, or even nail loss.
