Final answer:
The posterior thoracic muscles that move the pectoral girdle are the trapezius, rhomboid major, and rhomboid minor. These muscles help stabilize and position the pectoral girdle.
Step-by-step explanation:
The posterior thoracic muscles that move the pectoral girdle include the trapezius, rhomboid major, and rhomboid minor. These muscles work together to stabilize and position the pectoral girdle. The trapezius muscle, for example, helps retract and elevate the scapula, while the rhomboid muscles assist in scapular retraction and downward rotation.