Where does the proximal nail fold extend from?

The proximal nail fold is the fold of skin that serves as a protective barrier at the base of the nail. It extends from the edge of the visible nail plate, which is the part of the nail that is seen above the skin, to the first joint of the finger. This area is crucial for the health of the nail, as it helps to prevent infections and provides support to the nail structure.

Understanding this anatomical detail emphasizes the relationship between the visible nail plate and the underlying structures of the finger, specifically highlighting the function of the proximal nail fold in anchoring the nail and facilitating its growth. Other options do not accurately describe the location and role of the proximal nail fold, making this the best choice for the question asked.