Caleb Foster
The quick, or hyponychium, is the area of epithelium underlying the free edge of the nail plate. It is the tender, sensitive flesh beneath the nail plate at the junction between the free edge and the skin of the fingertip. The word quick is derived from the Latin vīvus, meaning living, and refers to the fact that the nail itself is dead tissue, whereas the quick is living flesh.
| Characteristics | Values |
|---|---|
| What is it? | The quick, or hyponychium, is the area of epithelium, particularly the thickened portion, underlying the free edge of the nail plate. |
| Etymology | The word 'quick' is derived from the Latin 'vīvus', meaning 'living'. |
| Location | The quick is located beneath the nail plate at the junction between the free edge and the skin of the fingertip. |
| Function | The quick forms a seal that protects the nail bed from pathogens. |
| Appearance | The quick is the very sensitive area of flesh under a fingernail or toenail. |
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What You'll Learn
- The quick is the sensitive flesh under the nail
- The hyponychium is the thickened portion of epithelium underlying the nail plate
- The lunula is the whitish, crescent-shaped base of the nail
- The nail plate is made of translucent keratin protein
- The nail matrix produces new cells that become the nail plate
The quick is the sensitive flesh under the nail
The quick, also known as the hyponychium, is the sensitive flesh under the nail. It is the epithelium located beneath the nail plate at the junction between the free edge and the skin of the fingertip. The word "quick" comes from the Latin "vīvus", meaning "living", and refers to the fact that the flesh under the nail is alive, whereas the nail itself is made of dead, compacted cells.
The quick is highly sensitive because it contains nerves and blood vessels. It is also the area where the nail matrix, which generates new cells, is located. The matrix produces new keratin that gathers at the nail plate and slowly pushes the nail forward, causing it to grow. The nail plate, or the hard part of the nail that is visible, is made of a tough rigid protein called alpha-keratin.
The quick is important for protecting the nail bed, which is the skin beneath the nail plate. The nail bed is highly innervated, meaning that it contains many nerve endings, and removing the nail plate from the nail bed is often extremely painful. The nail bed is nourished by the nerves and blood vessels found in the quick.
The quick is also important for maintaining the health of the nail. The nail serves to protect the fingertip and enhance the sensitivity of the fingertip, and the quick helps to seal and protect the nail bed, preventing pathogens from infecting it. By keeping the nail bed healthy, the quick helps to ensure the proper function of the nail.
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The hyponychium is the thickened portion of epithelium underlying the nail plate
The hyponychium, also known as the 'quick', is the thickened portion of epithelium underlying the nail plate. The nail plate, or nail body, is the hard, outer part of the nail, made of several layers of dead, compacted cells. The hyponychium is the soft tissue found beneath this, at the junction between the free edge of the nail plate and the skin of the fingertip.
The hyponychium is sometimes referred to as the 'quick' because, unlike the nail plate, it is made of living flesh. The word 'quick' in this context is derived from the Latin 'vīvus', meaning 'living', and is related to words such as 'vitality' and 'vivisection'. The phrase 'bitten to the quick' refers to biting one's nails down to the sensitive flesh beneath.
The hyponychium forms a seal that protects the nail bed, which is the skin beneath the nail plate. The nail bed contains nerves and blood vessels that supply nourishment to the nail. The nail plate is strongly attached to the nail bed but does not contain any nerves or blood vessels itself.
The hyponychium is not always visible. In fair-skinned people, it can be recognised by its glassy, greyish colour. However, it is not visible in some individuals, while in others, it is highly prominent.
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The lunula is the whitish, crescent-shaped base of the nail
The lunula is an area vulnerable to damage as it is full of slightly soft nail cells that are not fully keratinised. The nail matrix contains nerves, lymph, and blood vessels, and it produces the cells that become the hardened nail plate. Although everyone has a nail matrix, not everyone will have a visible lunula on each nail. The lunula may vary in appearance across each nail, and it is usually smaller on the pointer finger, gradually shrinking until it is barely visible on the pinkie finger.
Discoloured or missing lunulae are usually not a cause for concern. However, blue-grey lunulae may be a sign of silver poisoning, causing the nails to thicken and grow slowly. Additionally, red lunulae may indicate heart failure, and brown lunulae could be a sign of chronic renal failure due to increased melanin production. In some cases, missing lunulae may result from trauma or signal issues with the cardiovascular system, heartbeat disruption, or low blood pressure.
The term "quick" refers to the very sensitive area of flesh under the fingernail or toenail. The flesh is alive, in contrast to the hard and dead nail. The word "quick" is derived from the Latin "vīvus," meaning living, and it is related to words such as "vitality" and "vivisection."
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The nail plate is made of translucent keratin protein
The nail is a protective plate found at the tip of the digits (fingers and toes) of primates. It is made of a tough, rigid protein called alpha-keratin, a polymer also found in the claws, hooves, and horns of vertebrates. The nail plate, or nail body, is the visible hard nail area from the nail root to the free edge. It is made of translucent keratin protein and several layers of dead, compacted cells that cause the nail to be strong but flexible. The shape of the nail plate is determined by the form of the underlying bone.
The nail plate is strongly attached to the nail bed and does not contain any nerves or blood vessels. The nail bed, on the other hand, is highly innervated, and removal of the nail plate can be excruciatingly painful. The nail bed is the skin beneath the nail plate, and it is the area where the nail plate rests. Nerves and blood vessels in the nail bed supply nourishment to the entire nail unit.
The lunula is the whitish, crescent-shaped base of the visible nail. It is best seen in the thumb and may not be visible in the little finger. The lunula appears white due to a reflection of light where the nail matrix and nail bed meet.
The hyponychium, or "the quick", is the epithelium located beneath the nail plate at the junction between the free edge and the skin of the fingertip. It forms a seal that protects the nail bed. The word "quick" refers to the sensitive flesh under the nail, as the nail itself is dead, but the flesh is alive.
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The nail matrix produces new cells that become the nail plate
The quick of a fingernail refers to the sensitive area of flesh under a fingernail or toenail. The word "quick" is used because the nail is dead, but the flesh is alive.
Now, the nail matrix is the active tissue that generates new cells that become the nail plate. The nail plate, also known as the nail body, is the hard nail area from the nail root to the free edge. It is made of several layers of dead, compacted cells that cause the nail to be strong but flexible. 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 nail matrix produces 196 layers of cells that combine to make each of our fingernails and toenails. The cells start off slightly soft but harden and fill with keratin as they move outward from the nail root to the nail plate. The proximal area of the matrix is where the upper layers of the nail plate are formed, while the lower layers come from the distal end of the matrix. The cells closest to the matrix are the softest and therefore the easiest to damage. Conversely, the further a cell is from the matrix, the harder it is.
The nail matrix determines the thickness, width, and shape of the nail. A longer matrix will create more layers in the nail plate, resulting in a thicker nail. A flatter matrix will produce a flatter nail, while a more curved matrix creates a deeper C curve in the nail plate. The matrix is protected by the proximal nail fold, and any trauma to this area can easily damage the soft cells beneath. This is a common cause of occasional white spots, ridges, or grooves on the nail plate.
The health of the nail matrix is of paramount importance for the long-term health and vitality of the nail. Certain health conditions and medications can affect the nail matrix and interfere with nail growth. For example, fungal infections, peripheral artery disease, and skin conditions like severe eczema and psoriasis can all impact the nail matrix. Injuries such as pinching or crushing the finger can also damage the nail matrix and change the nail's appearance.
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Frequently asked questions
The quick of a fingernail is the very sensitive area of flesh under the nail. The nail itself is dead, but the flesh underneath is alive and full of nerves and blood vessels.
The word "quick" comes from the Latin "vīvus", meaning "living". The phrase ""cut to the quick" refers to cutting down to this living flesh beneath the nail.
The quick, or hyponychium, forms a seal to protect the nail bed from pathogens and infection.
The quick is the sensitive area of flesh under the nail, so it is important to avoid cutting it. The nail plate is made of dead tissue and sits on top of the quick, so it is safe to trim this area.
