Ava Monroe
Fingernails are protective plates found at the tips of the fingers and toes of primates, including humans. They are made of a tough, rigid protein called alpha-keratin, which also forms the cells of our hair and skin. While nails themselves are not alive, they start growing from living cells called the nail matrix or root located beneath the skin. This structure produces living cells that are pushed forward by new cells, forming the hard nail plate that we see on the surface. The nail matrix is connected to blood vessels and nerves, which supply nourishment and enable nail growth. The average human fingernail grows at a rate of approximately 3.5 mm per month, with toenails growing about half as fast. So, the question arises: despite being made of dead cells, are fingernails considered living things due to their connection with and dependence on living cells and tissues?
| Characteristics | Values |
|---|---|
| What is a fingernail? | A protective plate found at the tip of the fingers and toes of all primates, corresponding to the claws in other tetrapod animals. |
| What are fingernails made of? | A tough rigid protein called alpha-keratin, a polymer also found in the claws, hooves, and horns of vertebrates. |
| How do fingernails grow? | Nails grow because the cells are constantly being produced. Keratin cells form at the root and are slowly pushed forward by newly-formed cells. |
| What is the purpose of fingernails? | Fingernails protect the distal phalanx, the fingertip, and the surrounding soft tissues from injuries. They also enhance precise delicate movements of the distal digits through counter-pressure exerted on the pulp of the finger. |
| Are fingernails living things? | Fingernails are made of dead cells, but they start out as living cells. The nail matrix, or root, produces living cells that go on to form the nail. |
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What You'll Learn
Fingernails are made of a protein called alpha-keratin
Fingernails are made of a tough, rigid protein called alpha-keratin, which is also found in the claws, hooves, and horns of vertebrates. Keratin is a type of polymer that provides structure and strength to nails, making them resilient and protective.
The process of nail growth begins with the nail root, also known as the nail matrix or matrix unguis. This structure, located beneath the cuticle, generates living cells that form the nail plate. The nail matrix is an active tissue that produces keratin cells, which are then pushed forward by newly formed cells, causing the older cells to flatten and harden as they move outward. This continuous division of cells pushes the nail plate forward over the nail bed.
The nail plate, or nail, is the visible part of the nail unit. It consists of dead keratin cells that have been pushed out from under the skin. This is why cutting or trimming your nails is typically painless. The nail plate serves as a protective shield for the sensitive tips of our fingers and toes, defending them from injuries and enhancing our grip and dexterity.
The shape and growth of the nail plate are influenced by the nail matrix. The width and thickness of the nail plate depend on the size, length, and thickness of the matrix. Additionally, the lunula, a whitish crescent-shaped area at the base of the nail, is part of the nail matrix and can be more noticeable on the thumb.
While the nail plate itself is made of non-living keratin, the nail unit as a whole relies on blood vessels and nerves located in the nail bed and matrix to receive nourishment and maintain health. These underlying structures are living tissues that support the formation and growth of the nail plate. Overall, the presence of alpha-keratin in fingernails contributes to their strength and protective functions, making them an essential part of our anatomy.
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The nail matrix is the only living part of a nail
A 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. The nail consists of the nail plate, the nail matrix, and the nail bed below it. The nail matrix is the only living part of a nail. It is the active tissue (or germinal matrix) that generates new cells, which become the nail plate. The cells harden as they move outward from the nail root to the nail plate.
The nail matrix is located under the base of the nail, and the lunula (the white crescent shape at the base of the nail) is the only visible part of the nail matrix. The lunula can be seen in the thumb and may not be visible in the little finger. The lunula appears white due to the reflection of light where the nail matrix and nail bed meet. The nail bed is the skin beneath the nail plate, and it is where the nail adheres to the finger. It is made of two types of tissues: the dermis and the epidermis. The nail bed contains nerves and blood vessels that supply nourishment to the entire nail unit.
The nail matrix has two parts: the germinal matrix and the sterile matrix. The germinal matrix produces about 90% of the cells that make up the fingernails and toenails. The sterile matrix is responsible for the remaining 10% of cells and is more important in keeping the nail attached to the underlying skin. The cuticle, the semi-circular layer of almost invisible dead skin cells that cover the back of the nail plate, provides protection to the nail matrix.
Injuries and certain health conditions can damage the nail matrix and interfere with nail growth. For example, pinching or crushing the finger can injure the nail matrix, and a serious illness can interrupt nail growth and cause horizontal ridges in the nails. In rare cases, deep cuts or trauma to the germinal matrix can result in permanent damage, preventing the nail from growing back.
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Fingernails grow faster than toenails
A nail is a protective plate found at the tip of the fingers and toes of all primates. They 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, and the grooves surrounding it. The nail matrix is the only living part of a nail. It is the active tissue that generates cells, which harden as they move outward from the nail root to the nail plate.
The exact mechanisms that control the speed of nail growth are unknown. However, one theory suggests that frequent nail clipping may make nails grow slightly faster. While there is no scientific proof of this, regular clipping is still recommended over nail-biting for maintaining longer nails.
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Nails protect the fingertips and improve dexterity
Fingernails are made of a tough, rigid protein called alpha-keratin, which is also found in the claws, hooves, and horns of vertebrates. Keratin forms the cells of hair and skin, and it protects nails from damage by making them strong and resilient. The nail is composed of the nail plate, the nail matrix, and the nail bed below it, as well as the grooves surrounding it. The nail matrix, also known as the root, is the only living part of the nail. It is the active tissue that generates new cells, which harden as they move outward from the nail root to the nail plate. The nail plate is the tough, outer shield of the nail that we can see and touch.
The nail serves an important protective function for our fingertips. It acts as a miniature shield, covering and safeguarding the sensitive tips of our fingers. This protection is essential as our fingertips contain thousands of nerves, making them highly sensitive tools for interacting with our environment. Without nails, our fingertips would be more vulnerable to injuries and damage.
Additionally, nails enhance the dexterity and precision of our finger movements. They exert counter-pressure on the pulp of the finger, improving our ability to perform delicate tasks that require fine motor skills. For example, when the end of the finger touches an object, the nail acts as a counter-force, increasing the sensitivity of the fingertip. This allows for an "extended precision grip," such as pulling out a splinter, and enables certain cutting or scraping actions.
The shape of our nails also plays a role in our dexterity. The curved shape of the nail plate allows for a smoother and more controlled movement when running our fingers along surfaces. This curvature prevents the fingertips from catching or snagging on objects, providing a more seamless and precise interaction with our surroundings.
In summary, nails are essential for protecting our fingertips from harm and enhancing our manual dexterity. Their rigid structure, combined with their sensitive underlying tissues, showcases the intricate balance between strength and precision that our nails provide. By understanding the protective and functional roles of nails, we can appreciate their significance in our daily lives and the overall evolution of primate dexterity.
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Nails can indicate a person's overall health
A nail is a protective plate found at the tip of the fingers and toes of primates, made of a tough, rigid protein called alpha-keratin. The nail consists of the nail plate, the nail matrix, and the nail bed. The nail matrix is the only living part of the nail, containing nerves, lymph, and blood vessels. The cells produced by the nail matrix harden as they move outward from the nail root to the nail plate.
Changes in colour, texture, or shape can signal health problems. For instance, white spots on nails, known as leukonychia, can be a sign of heavy metal poisoning with lead or arsenic. They can also be caused by psoriasis, a chronic skin condition. If the entire nail turns white, this could suggest a deficiency of protein in the bloodstream, which may, in turn, indicate kidney or liver disease. Nails may also take on a bluish tinge if the body lacks adequate oxygen.
Nail biting, or onychophagia, can be a sign of obsessive-compulsive disorder (OCD) if it is excessive. "Spoon" nails, which are very thin and concave in shape, can be a sign of iron-deficiency anaemia. Beau's lines, or horizontal ridges that run across the nails, could indicate nutritional deficiencies such as insufficient protein or zinc deficiency. They could also be a sign of diabetes and peripheral vascular disease.
Clubbed nails, where the fingertips enlarge and the nails curve around them, can be a sign of lung disease, inflammatory bowel disease, cardiovascular disease, or liver disease. Thick, overgrown nails that resemble the horns of a ram may be hereditary or caused by conditions like psoriasis or poor circulation.
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Frequently asked questions
Fingernails are made of a protein called keratin, which is a type of dead cell. However, the nail matrix, or root, is a living part of the nail that generates new cells, which are then pushed outward to form the nail plate.
Fingernails have an evolutionary function, acting as miniature shields that protect the tips of our fingers. They also help us to grasp things and enhance the sensitivity of our fingertips.
Contrary to popular belief, fingernails do not grow after death. Instead, the skin dehydrates and tightens, which may give the appearance of growth.
The lunula is the whitish, crescent-shaped base of the fingernail. It is the visible part of the nail matrix and can be seen at the base of the thumb.
