The Muscles of the Back: An In-depth Analysis

💪The trapezius is a large muscle in the back with three functions: elevating the scapula, extending the neck, and retracting the scapula.

🔄The infraspinatus and teres minor are muscles involved in lateral rotation or external rotation at the shoulder joint.

🤜The teres major extends and adducts the arm at the shoulder joint, and medially rotates the shoulder.

💪The latissimus dorsi is a large muscle that extends, adducts, and medially rotates the arm at the shoulder joint.

👥The rhomboids are muscles that retract the scapula, working in synergy with the trapezius.

What are the main functions of the trapezius muscle?

—The trapezius muscle has three main functions: elevating the scapula, extending the neck, and retracting the scapula.

Which muscles are involved in lateral rotation at the shoulder joint?

—The infraspinatus and teres minor muscles are involved in lateral rotation or external rotation at the shoulder joint.

What are the functions of the teres major muscle?

—The teres major muscle extends and adducts the arm at the shoulder joint, and medially rotates the shoulder.

What are the functions of the latissimus dorsi muscle?

—The latissimus dorsi muscle extends, adducts, and medially rotates the arm at the shoulder joint.

What are the functions of the rhomboid muscles?

—The rhomboid muscles retract the scapula, working in synergy with the trapezius.

00:00Introduction to the muscles of the back and their functions.

00:11An in-depth analysis of the trapezius muscle and its three functions.

00:45The infraspinatus and teres minor muscles and their role in lateral rotation at the shoulder joint.

01:31The teres major muscle and its functions in arm extension, adduction, and medial rotation.

02:41The latissimus dorsi muscle and its functions in arm extension, adduction, and medial rotation.