These functions include: Trapezius: Your traps serve to elevate your shoulders. The middle and lower trapezius function to retract your shoulders, pulling them backward. Rhomboids: The rhomboids serve to retract and stabilize your shoulder blades. Latissimus dorsi: Your latissimus functions to extend and medially rotate your upper arm bone.
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Working on the pectoral girdle, the trapezius, rhomboid major, and levator scapulae muscles of the back elevate the scapula to shrug the shoulders and move the scapula posteriorly (as in reaching back behind the body).
Shoulder Back Muscles Image
