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Questions and Answers
What is the function of the trapezius muscle?
What is the function of the trapezius muscle?
What does the latissimus dorsi muscle do?
What does the latissimus dorsi muscle do?
Adducts the shoulder and causes extension of shoulder joint
The deltoid is the antagonist of the latissimus dorsi.
The deltoid is the antagonist of the latissimus dorsi.
True
What is the prime mover of back extension?
What is the prime mover of back extension?
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What is the function of the quadratus lumborum?
What is the function of the quadratus lumborum?
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What action do the rhomboids perform?
What action do the rhomboids perform?
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What is the synergist of the trapezius in scapular elevation?
What is the synergist of the trapezius in scapular elevation?
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What is the function of the teres major?
What is the function of the teres major?
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What muscle prevents downward dislocation of the humerus?
What muscle prevents downward dislocation of the humerus?
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What does the infraspinatus muscle do?
What does the infraspinatus muscle do?
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What muscle lies immediately inferior to the infraspinatus?
What muscle lies immediately inferior to the infraspinatus?
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What is the function of the serratus anterior?
What is the function of the serratus anterior?
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Study Notes
Posterior Trunk Muscles
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Trapezius: Key muscle for shoulder shrugging and head extension. It elevates, stabilizes, and depresses the scapulae.
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Latissimus Dorsi: Facilitates shoulder adduction and extension of the shoulder joint; important for upper body movements.
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Deltoid: Functions as an antagonist to latissimus dorsi, primarily involved in shoulder abduction and arm movements.
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Erector Spinae: A crucial muscle group for back extension, composed of three columns that maintain posture and assist in standing.
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Quadratus Lumborum: Contributes to the posterior abdominal wall structure, helping maintain upright posture and stabilize the pelvis.
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Rhomboids: Responsible for the inferior rotation of the scapula's glenoid cavity and retracting the scapulae, they help square the shoulders.
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Levator Scapulae: Works alongside the trapezius to elevate the scapula and can flex the head to the same side.
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Teres Major: Acts as a synergistic muscle with the latissimus dorsi to assist in the extension and adduction of the humerus.
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Supraspinatus: A rotator cuff muscle that plays a protective role by preventing downward dislocation of the humerus.
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Infraspinatus: Another rotator cuff muscle, responsible for laterally rotating the humerus and stabilizing the shoulder joint.
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Teres Minor: This rotator cuff muscle is located just below the infraspinatus and assists in lateral rotation of the humerus.
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Serratus Anterior: Keeps the scapula pressed against the thoracic wall, essential for shoulder movements and stability.
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