Liam Carter
Fingernails are composed of a protein called keratin, which is also found in hair and skin. While fingernails are not essential for survival, they have several important functions, including aiding in gripping and picking up small objects, providing protection for the sensitive areas underneath, and offering clues about our overall health. Fingernails are present in all primates, including humans, monkeys, and apes, and are believed to have evolved from claws to suit our specific needs, such as tool use and fine motor skills.
| Characteristics | Values |
|---|---|
| Enhance grip | Help in holding things tightly |
| Protection | Protect the fingertips and toes from injury and infections |
| Support | Provide support to fingertips |
| Build counter pressure | Help in creating counter pressure in the fingertips, which increases sensation and sensitivity |
| Medical diagnosis | Can be used to diagnose different medical conditions |
| Evolution | Humans have evolved to have nails instead of claws |
| Composition | Made of keratin, a type of protein |
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What You'll Learn
Fingernails help us pick things up
Fingernails also enhance our grip, particularly when picking up small objects. This enhanced grip is useful for many tasks, such as creating and using complex tools, which require extreme dexterity and fine motor functions. In fact, the evolutionary pressure to develop fingernails may have been related to the need for humans to create and use tools effectively.
The presence of fingernails also supports our fingertips, helping to prevent our fingertips from rolling backward when we hold something. This support is especially important for primates, including humans, monkeys, and apes, as our fingertips are wider on average than those of most other primates.
While fingernails are not essential for survival, they provide several advantages that enhance our ability to pick things up and perform other tasks requiring dexterity and fine motor skills.
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They aid in protection and grip
Fingernails provide protection and enhance grip. They are wide, flat, and shield-shaped, and they are present at the back of the fingertips. This structure and placement of fingernails help to keep our fingertips from bending backward when we hold something. They provide a counterforce to the pressure exerted by our fingertips, which increases the sensitivity of our fingertips' nerve endings. This, in turn, helps us manipulate objects and gives us greater sensory acuity.
Fingernails are also useful when we need to climb or sprint, as they increase the sensitivity of our fingertips. They are particularly advantageous when it comes to manipulating small details and creating and using complex tools. This is something that sets us apart from other primates, who have thin, curved, and pointed claws that wrap around the end of their fingers and toes. While claws are useful for certain activities, such as scratching, climbing trees, or digging, they would get in the way when trying to hold or pick up small objects.
The presence of fingernails in primates is also linked to social bonding through communal grooming behaviors. Primates, including humans, monkeys, apes, and lemurs, engage in grooming each other's fur to remove parasites and build social connections. Fingernails are better suited for this task than claws, as they allow for more precise and delicate movements.
In summary, fingernails provide protection for our fingertips, enhance our grip, and increase our sensory perception. They have evolved to suit our specific needs as primates and have contributed to our success as a species.
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They can indicate underlying health conditions
Fingernails are made of keratin, a type of protein. Since these cells are no longer living, they can be trimmed without causing pain. However, they represent formerly living cells that once required nutrients and proteins to survive. Therefore, deformities in the nails can indicate potential underlying health problems, such as nutritional deficiencies.
Nail Colour
The colour of your nails can indicate a variety of health conditions. For example, healthy nails are generally pink. Pale nails can indicate anaemia, congestive heart failure, liver disease, or poor nutrition. Nails with a bluish tint can mean the body is not getting enough oxygen, which could be due to a lung problem such as emphysema, or heart disease. Yellow nails are common and may be caused by dark nail polish, smoking, or a fungal infection. However, in rare cases, they can indicate severe thyroid disease, lung disease, diabetes, or psoriasis.
Nail Shape
The shape of your nails can also indicate underlying health issues. Healthy nails should be convex, curving slightly outwards. Concavity, also known as koilonychia, occurs when the nails bend up at the sides, forming a U-shape. This could be a sign of anaemia, iron deficiency, or coeliac disease. Clubbed nails, which are shaped like upside-down spoons, can be a sign of lung cancer or other serious conditions, such as inflammatory bowel disease or cardiovascular disease.
Nail Disorders
Certain nail disorders can indicate underlying health conditions. For example, leukonychia, which causes white flecks on the nail, can be a sign of vitamin or mineral deficiencies, or even heavy metal poisoning with lead or arsenic. Chronic paronychia causes inflammation, redness, tenderness, and swelling of the skin surrounding the nails and is usually caused by irritants, allergens, or a fungal infection. In rare cases, it can be caused by psoriasis or skin cancer.
Nail Sensitivity
The existence and strength of fingernails help provide counter pressure to the fingertips, increasing sensitivity. This aids in manipulating objects and performing delicate tasks. Therefore, any changes in nail sensitivity or texture can impact an individual's ability to perform tasks requiring dexterity and fine motor skills.
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They provide counter pressure to fingertips
Fingernails provide counter pressure to fingertips, which helps to keep our fingertips from bending backwards when we hold something. This is especially important for delicate tasks that require extreme dexterity and the ability to manipulate small objects.
The strength and existence of fingernails provide a counter-force that increases the sensitivity of the pads of our fingertips. This is because the hard nail acts as a back-wall, preventing the fingertip from squishing back around the bone. As a result, our nerves can more easily sense the fine pressure differentials of subtle textures.
Fingernails, therefore, enhance our grip and improve our ability to manipulate objects. They also increase our sensory acuity, making us more adept at handling complex tools and performing intricate tasks.
The presence of fingernails is thought to have evolved in primates, including humans, monkeys, and apes, as a way to support our fingertips and improve our grasping abilities. The wide and flat shape of human fingernails, in particular, is well-suited for grasping and picking up small objects, which is something that would be hindered by the presence of claws.
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They are useful for climbing and sprinting
Fingernails are present in all primates, including humans, monkeys, and apes, and are believed to have evolutionary similarities with claws. While claws are useful for certain activities, such as climbing trees or digging, they can get in the way when trying to grasp objects. This is where fingernails come in handy.
Fingernails provide a rigid backing to our fingertips, improving our ability to grasp and hold onto things. They also increase the sensitivity of our fingertips, making us more adept at manipulating and picking up small objects. This enhanced dexterity is essential for creating and using complex tools, a unique ability of humans.
The strength and structure of fingernails also help to prevent our fingertips from rolling backward when we grip or lift objects. This is especially important for activities like climbing and sprinting, where a secure grip is crucial. Without fingernails, our fingertips would lack the necessary counter-pressure to maintain a firm grasp, potentially leading to dangerous slips or falls.
Additionally, the shape of our fingernails is well-suited for these activities. Unlike the thin, curved, and pointed claws of cats and dogs, our nails are typically wide, flat, and shield-shaped. This shape allows us to grasp branches or surfaces more effectively during climbing or sprinting, providing a larger surface area for contact and stability.
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Frequently asked questions
We need fingernails because they help us pick things up, such as food, and pick things off, like bugs. They also help us hold on to things. Nails provide a rigid backing to our fingertips, improving our grip and dexterity.
Fingernails provide counter-pressure to our fingertips, increasing our sensitivity and making it easier to manipulate objects. They also help to protect our fingertips and prevent them from rolling backward when we hold something.
Fingernails are made of keratin, a protein made by the nail root. Keratin cells are no longer living, which is why you can trim your fingernails.
