Question 1

What is the nail matrix responsible for?

Accepted Answer

The nail matrix is the growth center of the nail located beneath the base of the nail plate, under the proximal nail fold. It contains stem cells that divide and produce nail cells (onychocytes) that form the nail plate. Damage to the matrix can permanently affect nail growth.

Question 2

What is the hyponychium?

Accepted Answer

The hyponychium is the thickened skin at the junction between the free edge and the fingertip (distal nail bed). It forms a seal that protects the nail bed from pathogens. Cutting or cleaning beneath the nail aggressively can damage this seal.

Question 3

The nail plate is composed primarily of which protein?

Accepted Answer

The nail plate is composed of hard keratin — a fibrous structural protein also found in hair. The nail plate has three layers (dorsal, intermediate, and ventral) and is translucent, appearing pink due to the underlying vascular nail bed.

Question 4

What is the lunula?

Accepted Answer

The lunula is the pale, crescent-shaped area visible at the proximal end of the nail plate, most visible on the thumbs. It is white because the cells in this area of the matrix have not yet fully keratinized. It is most prominent on the thumbs.

Question 5

At approximately what rate do fingernails grow?

Accepted Answer

Fingernails grow approximately 3–5 mm per month (about 1/8 inch), making a full nail replacement take about 4–6 months. Toenails grow more slowly — about 1.5 mm per month. Growth rate is affected by age, nutrition, health status, and season.

Question 6

The lunula is the white, half-moon shaped area at the base of the nail. It is the visible portion of which nail structure?

Accepted Answer

The lunula is the distal (visible) portion of the nail matrix, where active cell division and nail plate formation occur. Its white appearance results from the loosely packed, incompletely keratinized cells visible through the nail plate.

Question 7

The hyponychium is the epithelial tissue located:

Accepted Answer

The hyponychium is the sealed junction between the underside of the free edge of the nail plate and the fingertip skin (distal nail bed). It forms a waterproof barrier protecting the nail bed from debris and pathogens. Lifting this seal increases infection risk.

Question 8

The cuticle (true cuticle) is the non-living tissue that:

Accepted Answer

The true cuticle (eponychium dead skin remnant on the nail plate) seals the proximal nail fold against pathogens. Nail technicians should gently push and remove this non-living tissue — not cut into the live eponychium, which could cause infection.

Question 9

Which layer of the nail plate is responsible for giving the nail its hardness?

Accepted Answer

The nail plate is composed of 100 layers of hardened (keratinized) cells called onychocytes, rich in the protein keratin. Disulfide bonds between keratin chains provide the nail plate's hardness and water resistance. The nail bed has no role in nail plate hardness.

Question 10

On average, how fast does a fingernail grow?

Accepted Answer

Fingernails grow approximately 3–4 mm per month (about 1 mm per week) on average. Growth rate varies by age, nutritional status, season (faster in summer), and dominant hand (dominant hand nails grow slightly faster). Toenails grow approximately 1.5 mm per month — slower than fingernails.

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