Nail growth originates from active tissue known as the matrix located in the:

Nail growth originates from active tissue known as the matrix, which is found at the base of the nail under the cuticle. The matrix is responsible for generating new cells that become the nail plate as they harden and move forward. The health and function of the matrix are crucial for proper nail growth, as any damage to this area can inhibit the production of nail material, leading to potential deformities or growth issues.

The other areas mentioned, such as the nail bed, nail fold, and nail root, play supportive roles in nail structure and protection but do not serve as the site of active nail growth. The nail bed is the skin underneath the nail plate, while the nail fold refers to the skin surrounding the nail. The nail root is more associated with the area beneath the proximal nail fold where the matrix resides but is not specifically where the nail matrix's active tissue is directly engaged in growth.