Dagens.com on MSN: Why a dark line on your nail shouldn’t be ignored A nail is a protective plate characteristically found at the tip of the digits (fingers and toes) of almost all primates (except for marmosets), corresponding to the claws in other tetrapod animals. Fingernails and toenails are made of a tough rigid protein called alpha-keratin, a polymer also found in the claws, hooves, and horns of vertebrates. Nails are structures at the tips of your fingers and toes that protect delicate tissues beneath them.

Context Explanation

Healthy fingernails and toenails have a smooth texture and are strong enough to withstand the wear and tear of daily tasks. Your nails are part of your body’s outer layer, which healthcare providers call your integumentary system. Did you know that your fingernails can provide important information about your health? Read on to learn about how changes in the way your fingernails look could signal medical concerns that you shouldn't ignore.

Insight Material

If you notice these changes, make an appointment with your health care team. Looking for the top nail trends of 2026? Start with this list of the hottest nail colors & designs forecasted by editors to be all the rage! The meaning of NAIL is a horny sheath protecting the upper end of each finger and toe of humans and most other primates. How to use nail in a sentence.

Final Conclusion

Conditions like psoriasis and fungal infections can affect the strength and shape of your nails. Your nails offer functional purposes like scratching, sensation, and improving fine motor... Fingernails and toenails grow in the same manner since they share the same structure. However, fingernails grow faster than toenails. The growth of both can be influenced by age, injuries, and health issues. Illustration by Alex Dos Diaz for Verywell Health.