Nails (anatomy)

Nails (anatomy) are a key part of the human body's integumentary system, serving several important functions in daily life and overall health. Composed primarily of a hard, protective protein called keratin, nails are found at the tips of fingers and toes. Their main roles include protecting the distal phalanx, the fingertip, and the surrounding soft tissues from injuries. They also enhance precise small movements of the digits through counter-pressure exerted on the pulp of the finger.

Structure

The structure of a nail can be divided into several parts: the nail plate, the visible hard part of the nail; the nail matrix, a tissue under the skin that produces cells that become the nail plate; the nail bed, the skin beneath the nail plate; the cuticle, the tissue that overlaps the nail plate at the base; the nail folds, the skin folds that frame and support the nail on three sides; and the lunula, the crescent-shaped whitish area of the nail bed seen at the base of the nail plate.

Function

Nails serve multiple functions:

• Protection: They protect the distal phalanx, fingertips, and the surrounding soft tissues from external injuries.
• Sensory Role: Nails enhance tactile perception and fine motor skills by acting as a counter-pressure when the fingers touch an object.
• Aesthetic and Social Functions: Healthy nails are often considered a sign of good health and hygiene, playing a significant role in social interactions and self-care practices.

Growth and Health

Nail growth is influenced by several factors, including nutrition, health, age, and environmental exposure. On average, fingernails grow about 3 mm per month, while toenails grow at about 1 mm per month. Various conditions can affect the health and appearance of nails, including fungal infections, nail psoriasis, and trauma. Proper nail care is essential for maintaining nail health and preventing infections.

Nail Disorders

Common nail disorders include:

• Onychomycosis (fungal nail infection)
• Psoriasis of the nail
• Onycholysis (nail detachment)
• Ingrown toenail
• Nail trauma

Nail Care

Proper nail care involves regular cleaning, trimming, and moisturizing. Avoiding harsh chemicals and physical trauma can also help maintain healthy nails. In cases of nail disorders, consulting a healthcare professional for appropriate treatment is recommended.