Which of the following structures contains nerves, lymph, and blood vessels?

The nail matrix is the structure that contains nerves, lymph, and blood vessels. This is the tissue located beneath the base of the nail, responsible for producing new nail cells. As new cells are generated in the nail matrix, they push older cells forward, forming the nail plate. The presence of nerves in the matrix is crucial for sensitivity, allowing the body to detect pain or pressure on the nail area. Similarly, blood vessels supply necessary nutrients to the growing nail, and lymphatic vessels play a role in immune response and fluid regulation.

In contrast, the nail bed, cuticle, and nail plate have different functions. The nail bed serves as the support structure for the nail plate but does not contain significant nerve, lymph, or blood vessels like the matrix does. The cuticle acts as a protective barrier for the nail matrix and helps prevent infection but is not involved in the nourishment or sensory function. The nail plate is the hard, visible part of the nail made from keratin, but it has no nerves or blood vessels within it, as it is composed of dead cells. Therefore, the nail matrix is the only structure among the choices that comprises nerves, lymph, and blood vessels, highlighting its critical role in nail health and growth.