Final answer:
The deltoid muscle does not move the shoulder girdle; it is involved in moving the arm by acting on the humerus. The trapezius muscle is one of the muscles that position the shoulder girdle.
Step-by-step explanation:
The muscle which does not move the shoulder girdle is the deltoid. The shoulder girdle, also known as the pectoral girdle, consists of the clavicle and scapula and provides a base for shoulder movements. Muscles that position this girdle include the subclavius, pectoralis minor, serratus anterior, trapezius, rhomboid major, and rhomboid minor. The deltoid, however, while associated with the shoulder, is primarily responsible for moving the humerus, the upper arm bone, rather than the shoulder girdle itself.
The pectoralis major and the latissimus dorsi are the two axial muscles that also move the humerus. These muscles originate on the axial skeleton and are involved in arm movements. In contrast, the trapezius is one of the posterior muscles that is responsible for positioning the scapula and shoulder girdle.