Caleb Foster
The nail is a keratin structure at the end of a digit. The growing part of the nail is under the skin at the nail's proximal end under the epidermis, which is the only living part of a nail. The nail root, or lunula, is the base of the nail underneath the skin and produces most of the nail's volume. The matrix, or nail bed, is the actively growing tissue below the nail root that produces new keratin. The nail plate, or nail body, is the hard nail area from the nail root to the free edge, made of translucent keratin protein. The nail bed contains blood vessels, nerves, and melanocytes that produce melanin. As the root grows, the nail moves down along the nail bed and adds material to the underside of the nail to make it thicker.
| Characteristics | Values |
|---|---|
| Part of the body where nails grow from | The nail root, also known as the nail sinus or germinal matrix |
| Location of the nail root | Underneath the skin at the base of the nail |
| Tissue type of the nail root | Actively growing tissue |
| Tissue type of the nail bed | Contains blood vessels, nerves, and melanocytes that produce melanin |
| Direction of nail growth | Nails grow diagonally, faster towards the tip than upwards |
| Cells involved in nail growth | Nails are made of keratin, which consists of dead cells |
| Speed of nail growth | Healthy fingernails grow at about 3 millimeters per month, while toenails grow slightly slower |
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The nail root
The growing part of the nail is the only living part, and it is found under the epidermis at the nail's proximal end. When the nail stops receiving blood flow, it is no longer attached.
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The nail bed
The matrix, located beneath the skin at the inner edge of the nail plate, is responsible for most of the nail's growth. It constantly produces new keratin cells, which accumulate at the nail plate and push the older cells outward, resulting in nail growth. This growth occurs diagonally, with the nail extending both upward from the bed and outward towards the tip. As the nail grows, it remains attached to the nail bed through blood vessels, ensuring a continuous supply of nutrients and oxygen.
In summary, the nail bed, or sterile matrix, is integral to nail growth and thickness. It provides a smooth surface for the nail to grow along and houses essential blood vessels, nerves, and melanocytes. The nail bed's role in supporting nail growth contributes to the overall health and appearance of the nail.
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The matrix
The nail matrix constantly produces new keratin, a protein found in nails, hair, and skin that protects against infection. This keratin gathers at the nail plate and slowly pushes the nail forward, causing it to grow. The nail grows diagonally, much faster towards the tip than upward. As the root grows, it adds material to the underside of the nail, making it thicker. The thickness of the nail is determined by the nail bed, which contains blood vessels, nerves, and melanocytes that produce melanin.
The nail plate, or nail body, is the visible hard nail area from the nail root to the free edge, made of translucent keratin protein. The pinkish appearance of the nail comes from the blood vessels underneath it. The nail plate is strongly attached to the nail bed and does not contain any nerves or blood vessels. The grooves on the underside of the nail plate help anchor it to the nail bed.
The growing part of the nail is the only living part and is under the skin at the nail's proximal end under the epidermis. As the nail grows, new cells advance forward to form the nail until it reaches the outer edge and is removed. Without the nail matrix, no nail growth is possible.
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Nail growth and blood flow
Fingernails and toenails are made of a protein called keratin, which is also found in hair and skin. The nail matrix is where the nails form and grow. The nail matrix is located beneath the skin, at the inner edge of the nail plate, and is responsible for most of a nail's growth. The nail root, which is part of the nail matrix, produces most of the volume of the nail and the nail bed. The nail bed contains blood vessels, nerves, and melanocytes that produce melanin. As the root grows, the nail moves down along the nail bed and adds material to the underside of the nail to make it thicker.
The nail plate is the actual fingernail or toenail, and it is made of translucent keratin. The pinkish appearance of the nail comes from the blood vessels that are underneath it. The underside of the nail plate has grooves that help anchor it to the nail bed, while the free edge is the part of the nail plate extending from the finger or toe (the white tip that is usually trimmed).
Nail growth can be affected by various factors, including injuries, certain medications, and health conditions. For example, chemotherapy and other medications can cause Beau's lines (horizontal ridges on the nails) or slow nail growth. Peripheral artery disease (PAD) can also reduce blood flow to the legs and feet, affecting the nail matrix and slowing nail growth. Additionally, severe eczema and psoriasis can interfere with nail growth and cause nail changes such as white lines, pitting, and crumbling.
Poor blood flow can also impact nail health and growth. Inadequate blood flow deprives the nail matrix of essential nutrients and oxygen, resulting in reduced or halted nail growth. This can be frustrating if a toenail falls off or cracks and takes longer to grow back, leaving the toes vulnerable. Poor circulation can also cause nails to become brittle and discoloured, often appearing yellowed or darkened. Thickened nails can also be a result of poor blood flow, as it may contribute to the accumulation of nail cells, making the nails difficult to trim and maintain. While not directly caused by poor circulation, individuals with compromised blood flow, such as those with diabetes, are at higher risk for complications from ingrown toenails and may experience infections and delayed healing.
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The nail plate
The shape of the nail plate is determined by the form of the underlying bone. It can be flat, arched, or hooked, depending on the shape of the fingertip bone. The width and thickness of the nail plate, on the other hand, are determined by the size, length, and thickness of the matrix. The matrix is the area of soft tissue proximal to the nail bed, where new cells are constantly dividing and becoming keratinised to form the nail plate.
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Frequently asked questions
Nails grow from the nail root, which is also called the nail sinus or germinal matrix. It is the actively growing tissue below the nail plate.
The nail plate, or corpus unguis, is the hard nail area that extends from the nail root to the free edge. It is made of translucent keratin protein.
The nail root is the base of the nail that lies underneath the skin. It produces most of the nail's volume and determines its length.
The nail bed, or sterile matrix, extends from the edge of the nail root to the hyponychium. It contains blood vessels, nerves, and melanocytes that produce melanin. The nail bed determines the thickness of the nail.
Nails grow as new keratin cells are produced in the nail matrix and push outward, causing the nail to grow diagonally.
