Shoulder Quiz Intermediate

Which muscle plays a key role in initiating shoulder abduction before the deltoid takes over?

• Supraspinatus

• Infraspinatus

• Teres minor

• Pectoralis major

Which muscle is involved in both shoulder extension and adduction?

• Deltoid (posterior fibers)

• Latissimus dorsi

• Supraspinatus

• Trapezius

Which of the following muscles contributes significantly to shoulder internal rotation and is also part of the rotator cuff?

• Subscapularis

• Infraspinatus

• Teres major

• Supraspinatus

During shoulder flexion, which muscle works eccentrically to control the downward phase of shoulder extension?

• Latissimus dorsi

• Pectoralis major

• Deltoid (posterior fibers)

• Subscapularis

Which muscles are the primary agonists for shoulder horizontal adduction?

• Pectoralis major and Deltoid (anterior fibers)

• Latissimus dorsi and Teres major

• Infraspinatus and Teres minor

• Deltoid (posterior fibers) and Trapezius

Which rotator cuff muscle assists with shoulder external rotation?

• Teres minor

• Supraspinatus

• Subscapularis

• Pectoralis major

What is the role of the posterior deltoid in shoulder movements?

• Shoulder abduction

• Shoulder flexion

• Shoulder external rotation and extension

• Shoulder internal rotation

Which muscle helps prevent downward displacement of the humeral head during shoulder abduction?

• Supraspinatus

• Pectoralis major

• Trapezius

• Infraspinatus

Which two muscles work together to produce shoulder internal rotation during a closed-chain movement?

• Subscapularis and Pectoralis major

• Deltoid and Supraspinatus

• Trapezius and Latissimus dorsi

• Teres minor and Infraspinatus

Which muscle is responsible for lateral (external) rotation of the shoulder, and what are its antagonists?

• Infraspinatus; antagonists: Subscapularis and Pectoralis major

• Supraspinatus; antagonists: Deltoid and Trapezius

• Deltoid (posterior fibers); antagonists: Latissimus dorsi and Teres major

• Pectoralis major; antagonists: Deltoid (anterior fibers) and Supraspinatus