periosteum

The periosteum is a thin, tough layer of connective tissue that surrounds the outer surface of bones. It contains nerves and blood vessels that supply nutrients to the bone, helping it grow and heal. The periosteum also plays a crucial role in the attachment of muscles and tendons, facilitating movement and stability. It acts as a protective covering, supporting the bone's structure and repair process after injuries. Think of it as a nourishing, protective skin for the bone that contributes to its health and growth throughout life.