What is the function of the rhomboid muscles?

The rhomboid muscles, which consist of the rhomboid major and minor, are located in the upper back and are primarily responsible for the retraction of the scapulae (shoulder blades). Their main function is to draw the shoulder blades toward the spine and together, effectively aiding in actions such as shrugging the shoulders. They play a crucial role in stabilizing the shoulder girdle, enabling a range of upper body movements and maintaining proper posture. This muscle group is vital for activities that require raising the arms or pulling, as it helps to keep the shoulder blades in place during these movements. The other options pertain to different muscle groups altogether, which do not involve the actions associated with the rhomboids.