What is the fold of skin that overlaps the side of the nail called?

The fold of skin that overlaps the side of the nail is known as the sidewall. This is an important part of the nail structure, as it helps protect the nail matrix and maintains the health of the surrounding skin. The sidewall runs alongside the nail and serves as a barrier against pathogens and elements that could potentially harm the nail or the skin.

The cuticle, while also related to nail health, specifically refers to the area of skin that overlaps the base of the nail, providing a protective seal. The nail bed is the part of the nail underneath the nail plate, where the nail cells grow, and the lunula is the visible part of the nail matrix at the base of the nail, often seen as a white, crescent-shaped area. Understanding these distinctions helps in recognizing the anatomy of nails and the roles various parts play in nail care and health.