American Academy of Professional Coders (AAPC) Practice Exam

Question: 1 / 490

What is the term for the area of the nail bed that is visible, extending to the edges?

Lunula

The correct term for the area of the nail bed that is visible and extends to the edges is the lunula. This is the white, crescent-shaped area at the base of the nail that can often be seen through the nail plate. It represents the visible portion of the nail matrix, where new nail growth occurs. The lunula is important in terms of nail health and growth, as it indicates the health of the nail matrix beneath it.

The other terms listed refer to different structures related to the nail. The hyponychium is the area of thickened skin under the free edge of the nail. The cuticle is the layer of skin that overlaps the base of the nail, protecting the area between the skin and nail from infection. The eponychium is the tissue at the base of the nail that covers the nail matrix, also serving a protective function. Understanding these distinctions helps in the proper identification of nail anatomy.

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Hyponychium

Cuticle

Eponychium

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