California Cosmetology Written ExamNail CareMedium
A technician explains to a new client that the slightly thickened skin located just beneath the free edge of the nail plate helps prevent bacteria and debris from entering the nail bed. What structure is being described?
- ACuticle
- BEponychium
- CHyponychium
- DPerionychium
Show answer & explanationAnswer & explanation
Correct answer: C. Hyponychium
The hyponychium is the slightly thickened epidermis located under the free edge of the nail, forming a protective seal that prevents microorganisms and debris from entering the area between the nail bed and the plate. This differs from the eponychium and cuticle, which are located at the base of the nail.
Why the other options are wrong
- A. The cuticle is dead tissue at the nail base, not under the free edge.
- B. The eponychium is at the base of the nail plate, not under the free edge.
- D. Perionychium refers to skin surrounding the entire nail border, not this specific seal.
Hyponychium
The slightly thickened skin under the free edge of the nail plate that seals the nail bed from bacteria and debris.
- Located under the free edge
- Acts as a protective barrier
- Different from eponychium, which is at the base
Memory trick: Hyponychium = 'hidden underneath' seal guarding the free edge.