Which muscle is the primary mover in shoulder extension and adduction?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Study for the Muscle Actions and Functions – Anatomy and Movement Test. Equip yourself with multiple choice questions, each with detailed explanations and hints. Prepare confidently for your exam!

Multiple Choice

Which muscle is the primary mover in shoulder extension and adduction?

Explanation:
Shoulder extension and adduction require pulling the upper arm backward and toward the body. The latissimus dorsi is the strongest muscle for both actions, with a broad attachment from the lower back and pelvis to the humerus. Its line of pull directs the arm downward and backward, producing extension, and toward the midline to create adduction, especially when the arm is away from the body. While other muscles have related roles—serratus anterior stabilizes the scapula, subscapularis handles internal rotation and joint stability, and supraspinatus initiates abduction—the latissimus dorsi is the primary mover for extending and adducting the shoulder.

Shoulder extension and adduction require pulling the upper arm backward and toward the body. The latissimus dorsi is the strongest muscle for both actions, with a broad attachment from the lower back and pelvis to the humerus. Its line of pull directs the arm downward and backward, producing extension, and toward the midline to create adduction, especially when the arm is away from the body. While other muscles have related roles—serratus anterior stabilizes the scapula, subscapularis handles internal rotation and joint stability, and supraspinatus initiates abduction—the latissimus dorsi is the primary mover for extending and adducting the shoulder.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy