Final answer:
The blood vessels that nourish nail growth are located in the nail matrix, where nail growth occurs through the proliferation of stem cells.
Step-by-step explanation:
The matrix contains stem cells that proliferate, allowing the nail to grow continuously. This continuous growth occurs as the cells divide to form keratinocytes that produce the protein keratin, which makes up the nail. The nail bed lies underneath the nail plate and is visible as the pinkish part of your nails because of the capillaries present in the dermis. The cuticle, or eponychium, serves as a protective layer for the nail matrix. Whereas the lunula, the visible part of the matrix, appears as a crescent-shaped whitish area at the base of the nail.