Anatomy & SciencesQuestion 440 of 484
Which structure of the nail unit is the LIVING tissue responsible for producing new nail plate cells?
a.Nail plate (the visible, hardened nail)
b.Nail matrix (the living tissue beneath the proximal nail fold, partly visible as the lunula)
c.Hyponychium (the seal under the free edge)
d.Eponychium (the cuticle skin overlying the matrix)
Explanation
The nail matrix is the only LIVING part of the nail unit that actively divides to produce new nail plate. It lies under the proximal nail fold; the visible white half-moon (lunula) is the distal edge of the matrix showing through. Damage to the matrix from aggressive filing, trauma, or chemical injury can produce ridges, splits, or permanent nail deformity. The nail plate itself is dead, keratinized tissue. The hyponychium and eponychium are protective seals of skin. Manicurists who understand this anatomy are practicing safely within the scope California sets under Bus. & Prof. Code §7320 and §7321.
Law Reference: Bus. & Prof. Code §7320Practice all 484 questions free — no signup required.
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