Final answer:
The levator scapulae is a muscle that elevates the scapula and assists in lifting the arms at the shoulder. Other muscles involved in positioning and stabilizing the pectoral girdle include the trapezius, rhomboid major, and rhomboid minor. The clavicle and scapula make up the pectoral girdle, providing a stable origin for the muscles that move the humerus.
Step-by-step explanation:
Levator scapulae is a muscle involved in the movement of the pectoral girdle and upper limbs. It is classified as a posterior thoracic muscle and is responsible for elevating the scapula, helping to lift the arms at the shoulder.
Other muscles that position and stabilize the pectoral girdle include the trapezius, rhomboid major, and rhomboid minor. These muscles work together to move the scapula and assist in various shoulder movements.
The clavicle and scapula make up the pectoral girdle, providing a stable origin for the muscles that move the humerus. These muscles originate on the axial skeleton (pectoralis major and latissimus dorsi) and scapula (deltoid, subscapularis, supraspinatus, infraspinatus, teres major, teres minor, and coracobrachialis).