Question

which muscles are primarily responsible for shoulder extension? deltoid and supraspinatus latissimus dorsi and teres major pectoralis major and coracobrachialis serratus anterior and trapezius

Explanation:

• Deltoid (anterior) and supraspinatus perform shoulder abduction, not extension.
• Latissimus dorsi and teres major are the primary muscles that pull the humerus backward to achieve shoulder extension.
• Pectoralis major and coracobrachialis are responsible for shoulder flexion and adduction.
• Serratus anterior and trapezius stabilize the scapula, not shoulder extension.

Answer:

B. Latissimus dorsi and teres major