Liam Carter
Human fingernails are made of a tough, rigid protein called alpha-keratin, which is also found in the claws, hooves, and horns of vertebrates. They grow at an average rate of approximately 3.5mm a month and serve to protect the fingertip and surrounding soft tissues from injuries. While they may seem insignificant, fingernails can provide valuable insights into a person's health, with changes in colour or growth patterns potentially indicating medical conditions, nutritional deficiencies, or stress. Fingernails have been the subject of fascination and curiosity, with some individuals achieving fame by growing ultra-long nails, such as Shridhar Chillal, who holds the Guinness World Record for the longest fingernails, having not trimmed them since 1952. Beyond their functional and aesthetic aspects, fingernails have also played a role in human evolution, with scientists debating their purpose and impact on our ancestors' survival.
| Characteristics | Values |
|---|---|
| Growth rate | In humans, fingernails grow at an average rate of 2.5-3.5mm a month, whereas toenails grow about half as fast (1.6mm a month). |
| Regrowth | Fingernails require 3-6 months to regrow completely, and toenails require 12-18 months. |
| Growth factors | Actual growth rate is dependent upon age, sex, season, exercise level, diet, and hereditary factors. |
| Composition | Nails are made of a tough rigid protein called alpha-keratin, a polymer also found in the claws, hooves, and horns of vertebrates. |
| Water content | Nails include 7-12% water. |
| Blood supply | Nails have a rich blood supply, which helps them grow and gives them their pinkish colour. |
| Function | Nails strengthen the fingertips and protect the body from viruses and bacteria. |
| Longest fingernails | Shridhar Chillal has been growing the fingernails on his left hand since 1952. By 2014, they cumulatively measured 9.1m in length. |
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What You'll Learn
Human fingernails grow at an average rate of 3.5mm per month
The growth rate of nails is also related to the length of the terminal phalanges (outermost finger bones). In humans, the nail of the index finger grows faster than that of the little finger, and fingernails grow up to four times faster than toenails. The little fingernail grows slower than other fingernails, and this difference in growth rate may be due to the difference in length between the terminal phalanges of the little finger and those of the other fingers.
Fingernails are present in all primates, including humans, monkeys, and apes, and they serve several important functions. One of their main functions is to strengthen the fingertips, making them one of the strongest parts of the hand and enhancing grip. The hard, outer covering of the fingernails makes everyday tasks, such as gripping, less risky. Additionally, the fingernails have many small blood vessels that supply them with blood, maintaining blood flow even when gripping something very tightly.
Another important function of fingernails is protection. The fingernail covering helps prevent viruses and bacteria from entering the body. If the nail bed is disrupted, individuals may be at a higher risk for nail infections. Toenails also provide protection, mainly for the toes, which are vulnerable to injury and infections.
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Toenails grow slower than fingernails
Fingernails and toenails are made of a tough, rigid protein called alpha-keratin. This protein is also found in the claws, hooves, and horns of vertebrates. Nails evolved from claws about 55 million years ago, and are one of the features that distinguish primates.
Toenails grow at a slower rate than fingernails. Fingernails grow at an average rate of 3.47 mm/month, while toenails grow at an average rate of 1.62 mm/month. This means that fingernails grow about twice as fast as toenails. If you lose a toenail, it can take up to a year and a half for it to completely grow back, whereas a fingernail would take only a third of that time.
The difference in growth rate between fingernails and toenails is likely due to differences in use and trauma to the nail bed. The nails on the dominant hand grow faster than those on the non-dominant hand because they are subjected to more trauma. Similarly, fingernails are used more than toenails and are thus subjected to greater mechanical forces, resulting in increased blood and nutrient supply to the area and faster growth.
Age, nutrition, and season also play a role in nail growth. Nail growth slows with age as blood circulation decreases. Nutrition also affects nail growth, with malnourishment leading to slower growth. Finally, nails grow faster during the summer, possibly due to increased blood circulation.
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Nails are made of a tough, rigid protein called alpha-keratin
Human fingernails and toenails are made of a tough, rigid protein called alpha-keratin. This is a type of keratin found in vertebrates, and it is also present in claws, hooves, and horns. 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 provides strength and flexibility to the nail. The nail plate is strongly attached to the nail bed, which does not contain any nerves or blood vessels. The nail bed is the flat surface under the nails, and it sits on top of tiny blood vessels that feed it and give nails their pink colour.
The nail matrix, also known as the matrix unguis, is the active tissue that generates cells. It is the part of the nail bed that lies beneath the nail and contains 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, forming the hard, outer covering of the nail. This process gives rise to the nail's strength and protective function.
Alpha-keratin is a fibrous form of keratin, with a structure resembling the thread of a screw. It is one of 54 types of keratin found in the human body and is also present in hair, skin, horns, and claws. Keratin is a structural protein that provides hardness and water-resistant properties to the skin, hair, and nails. It is produced by cells called keratinocytes, which are the majority type of cell found in the epidermis.
The presence of alpha-keratin in nails contributes to their toughness and rigidity, making them an essential protective plate at the tips of the fingers and toes. This protective function helps to prevent viruses and bacteria from entering the body and enhances grip by strengthening the fingertips. Thus, the alpha-keratin in nails plays a crucial role in maintaining the overall health and functionality of the human body.
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Fingernails can be used to indicate overall health
Fingernails are made of a tough, rigid protein called alpha-keratin, which is also found in the claws, hooves, and horns of vertebrates. They are protective plates found at the tip of the digits (fingers and toes) of all primates, corresponding to the claws in other tetrapod animals. The growth rate of nails is related to the length of the outermost finger bones (terminal phalanges). Nails start in the nail root, hidden under the cuticle, and take around three to six months to regrow completely.
Healthcare and pre-hospital care providers often use the fingernail beds as a quick way to assess distal tissue perfusion in individuals who may be dehydrated or in shock. Additionally, problems in the liver, lungs, and heart can show up in your nails.
It is important to note that while fingernails can provide some indication of overall health, most nail issues are not a cause for serious concern and can be easily treated once identified. Proper nail care, such as regular trimming, moisturising, and avoiding biting or picking at them, can help maintain nail health and prevent infections.
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Manicures and pedicures are popular services for women and men
Human nails are made of a tough, rigid protein called alpha-keratin, which is also found in the claws, hooves, and horns of vertebrates. They play an important protective role, defending the body from viruses and bacteria. They also provide strength and support to the fingertips, making performing everyday tasks, such as gripping, easier and less risky.
Nails are not just functional but can also be a form of self-expression and fashion. Manicures and pedicures are popular services that help individuals, especially those who attend special occasions, enhance their appearance and complement their outfits and overall style. These services are offered by nail salons, which have gained popularity, particularly among women. In 2022, the women's segment dominated the market with a share of around 69%. Manicures are often viewed as a form of self-care and relaxation, providing a ritualistic experience for women to momentarily escape their hectic routines and indulge in pampering.
However, the perception of manicures and pedicures as solely a "woman's thing" is changing. More men are embracing nail care as part of their grooming routine and seeking professional services. Salon owners have observed an increase in men availing of manicure and pedicure services, and some salons have introduced campaigns specifically targeting men. This shift may be influenced by social media platforms like TikTok, which offer a multitude of nail art tutorials and have played a significant role in shaping the nail salon industry.
The availability of advanced nail care products, tools, and equipment has improved the quality of services and expanded the range of treatments offered. For example, the incorporation of gel polish creates demand for salon services, as customers seek professional assistance to ensure precise application, proper curing, and safe removal. Additionally, the expansion of nail salon franchises, particularly in North America, has fueled market growth, with brands strategically focusing on franchise expansion while maintaining high cleanliness standards and using chemical-free processes.
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Frequently asked questions
Human fingernails are made up of dead cells that have no feeling. The part of the nail that can be seen is dead and the layer of skin underneath, called the dermis, has sensory nerve endings.
Fingernails can grow to extreme lengths. The longest female nails ever recorded measured a total of 28 ft 4.5 in. Shridhar Chillal, who had been growing the fingernails on his left hand since 1952, had a thumbnail that was more than 6.5 ft long by 2014.
Fingernails grow at an average rate of approximately 3.5 mm (0.14 in) a month, while toenails grow about half as fast at an average of 1.6 mm (0.063 in) a month. Actual growth rates depend on factors such as age, sex, season, exercise level, diet, and hereditary factors.
It is recommended to trim your nails regularly, keeping them short. Fingernails should be trimmed straight across and slightly rounded at the top. Toenails should be trimmed straight across.
Fingernails are made of a tough, rigid protein called alpha-keratin, a polymer also found in the claws, hooves, and horns of vertebrates.
