Podcast
Questions and Answers
Which of the following actions is NOT performed by the latissimus dorsi muscle?
Which of the following actions is NOT performed by the latissimus dorsi muscle?
The teres major muscle abducts and laterally rotates the humerus.
The teres major muscle abducts and laterally rotates the humerus.
False (B)
What are the three sections of the deltoid muscle, and what action does each perform?
What are the three sections of the deltoid muscle, and what action does each perform?
The front section flexes, the rear section extends, and the middle section abducts the humerus.
The pectoralis major muscle originates from the clavicle and ______, and inserts on the humerus.
The pectoralis major muscle originates from the clavicle and ______, and inserts on the humerus.
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Match the muscle with its primary action on the humerus:
Match the muscle with its primary action on the humerus:
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Flashcards
Pectoralis Major
Pectoralis Major
Muscle that flexes, adducts, and medially rotates the humerus.
Latissimus Dorsi
Latissimus Dorsi
Muscle that extends, adducts, and medially rotates the humerus.
Teres Major
Teres Major
Muscle that adducts and medially rotates the humerus.
Deltoid
Deltoid
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Shoulder Muscles
Shoulder Muscles
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Study Notes
Upper Back & Shoulders: Prime Movers of the Arm
- Prime movers of the arm originate from the trunk and attach to the humerus
- Pectoralis Major: Flexes, adducts, and medially rotates the humerus; attaches to the clavicle and sternum, and humerus
- Latissimus Dorsi: Extends, adducts, and medially rotates the humerus; attaches to the iliac crest, T7-S5, and humerus
- Teres Major: Adducts and medially rotates the humerus; attaches to the scapula and humerus
- Deltoid: Flexes, extends, and abducts the humerus; 3 sections, front flexes; rear extends; middle abducts; requires scapula rotation; attaches to the clavicle, acromion process, and scapula; humerus
Upper Back & Shoulders: Prime Movers of the Arm (from Scapula to Humerus)
- Prime movers of the arm originate from the scapula and attach to the humerus
- Attachments include: clavicle, acromion process, scapula, and humerus
- The latissimus dorsi is a "helper muscle" for scapular rotation
Muscles Acting on the Shoulder Joint
- Muscles acting on the shoulder joint include the deltoid, latissimus dorsi, pectoralis major, and teres major.
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Description
Dive into the anatomy of the upper back and shoulders, focusing on the prime movers that facilitate arm movement. This quiz explores essential muscles like the pectoralis major, latissimus dorsi, and deltoid, detailing their functions and attachments. Test your knowledge on how these muscles interact to support various arm motions.
