Questions and Answers
What is the primary action of the Trapezius muscle?
What is the function of the Latissimus dorsi?
Shoulder extender
What does the posterior deltoid do?
Small shoulder extender
What are the functions of the Teres major?
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What is the role of the Rhomboideus major?
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What is the function of the Rhomboideus minor?
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What is the role of the Infraspinatus muscle?
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What muscles extend the spine?
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Study Notes
Back Muscles Overview
- Trapezius: Engages in multiple actions affecting the scapula and spine, crucial for shoulder movement and stability.
- Latissimus dorsi: Functions primarily as a shoulder extender, instrumental in overhead lifting and pulling movements.
- Posterior deltoid: A smaller muscle that assists in shoulder extension, contributing to arm positioning and stability.
- Teres major: Acts as both a shoulder rotator and extender, important in movements that involve internal rotation and extension of the arm.
- Rhomboideus major: Responsible for retracting the inferior aspect of the scapula, aiding in posture and shoulder blade movement.
- Rhomboideus minor: Similar to the major, this muscle retracts the superior part of the scapula, playing a role in overall shoulder mechanics.
- Infraspinatus: Part of the rotator cuff group; it stabilizes the shoulder joint and facilitates external rotation of the arm.
- Erector spinae: A group of muscles that extend and support the spine, crucial for maintaining posture and facilitating back movement.
Functional Significance
- Proper functioning of these muscles is essential for activities involving upper body strength, coordination, and stability.
- Injuries or weaknesses in these muscles can lead to limited movement and discomfort in daily activities and sports.
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Description
Test your knowledge of the back muscles with this labeling quiz. Identify key muscles such as the trapezius, latissimus dorsi, and others based on their functions. Perfect for students of anatomy and physiology!
