Into which three parts can the nail plate be divided longitudinally?

The nail plate can indeed be divided longitudinally into three distinct parts: the nail root, the nail body, and the free edge. The nail root is the portion of the nail that is buried beneath the skin at the base of the nail; it plays a crucial role in nail growth as it contains the germinal matrix where new nail cells are produced. The nail body, which is the visible part of the nail, extends from the nail root to the free edge and is the part that we typically maintain and decorate with nail polish. The free edge is the part of the nail that extends beyond the fingertip and is the portion that can be clipped or shaped.

Other choices do not accurately represent the longitudinal structure of the nail plate. For example, the cuticle, although important for nail health, does not constitute a part of the nail plate itself. Similarly, terms like nail bed and nail fold reference areas associated with the nail rather than parts of the nail plate. Understanding these components is essential for those studying nail anatomy and care in the beauty and wellness industry.