What are the prime movers for shoulder scaption?

What are the prime movers for shoulder scaption?

• A. Supraspinatus, Anterior Deltoid, & Middle Deltoid
• B. Infraspinatus and Teres Minor
• C. Subscapularis and Teres Major
• D. Latissimus Dorsi and Pectoralis Major

Answer: (A)

Shoulder scaption involves lifting the arm in the scapular plane, where the supraspinatus starts the lift and helps keep the humeral head centered in the glenoid, while the anterior and middle deltoids provide the bulk of the upward movement. The supraspinatus initiates abduction (especially the first 15 degrees) and works in concert with the deltoids, which are the primary abductors in this plane. The other muscles listed are mainly involved in external rotation or internal rotation/adduction and do not drive the initial and primary elevation in scaption. So the combination of supraspinatus with the anterior and middle deltoids best represents the prime movers for shoulder scaption.

Shoulder scaption involves lifting the arm in the scapular plane, where the supraspinatus starts the lift and helps keep the humeral head centered in the glenoid, while the anterior and middle deltoids provide the bulk of the upward movement. The supraspinatus initiates abduction (especially the first 15 degrees) and works in concert with the deltoids, which are the primary abductors in this plane. The other muscles listed are mainly involved in external rotation or internal rotation/adduction and do not drive the initial and primary elevation in scaption. So the combination of supraspinatus with the anterior and middle deltoids best represents the prime movers for shoulder scaption.