Deltoid, Pec Major, Coracobrachialis
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| What is the most important abductor of the shoulder? | Deltoid.
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| Which muscle resembles the Gluteals structurally? | Deltoid.
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| Which muscle, if discovered today, would be considered three independent muscles instead of one? | Deltoid.
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| Which muscle of the shoulder can be an antagonist to itself? | Deltoid.
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| What are the origins of the Deltoid muscle? | lateral third (1/3) of the clavicle
acromion process
scapular spine
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| What is the insertion of the Deltoid muscle? | Deltoid tuberosity.
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| What are the actions of the Deltoid muscle? | flexes the shoulder (anterior fibers)
medially rotates the shoulder (anterior fibers)
abducts the shoulder (middle fibers)
extends the shoulder (posterior fibers)
laterally rotates the shoulder (posterior fibers)
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| What is the nerve of the Deltoid muscle? | Axillary.
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| What is the origins of the Pectoralis Major? | medial half (1/2) of the clavicle
edge of the sternal body
ribs 1 through 7 (costal cartilages)
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| What is the insertion of Pectoralis Major? | intertubercle groove of the humerus (lateral lip)
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| What is the actions of the Pectoralis Major? | adduct the shoulder
medially rotates the shoulder
flexes the shoulder
extends the shoulder
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| What is the nerve for Pectoralis Major? | Medial pectoral nerve.
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| Which muscle forms the upper anterior chest wall and anterior axillary fold? | Pectoralis Major.
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| Tightness in which muscle can cause constriction of the chest and angina pectoralis - like pain or postural distortion such as rounded shoulders? | Pectoralis Major.
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| What is the origin of Coracobrachialis? | Coranoid process of the scapula.
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| What is the insertion of Coracobrachialis? | Medial humeral shaft (middle region).
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| What are the actions of Coracobrachialis? | flexes the shoulder
adducts the shoulder
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| What is the nerve for Coracobrachialis? | Musculocutaneous nerve.
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