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Deltoid

O: shoulder
I: Deltoid tuberosity of humerus
A: Anterior part: flexes and medially rotates arm; Middle part: abducts arm; Posterior part: extends and laterally rotates arm
Wikipedia Questions

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Infraspinatus

O: Scapula
I: Middle facet on greater tuberosity of humerus
A: Laterally rotate arm; helps to hold humeral head in glenoid cavity of scapula
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Latissimus Dorsi

O: Spine and thoracic vertebrae
I: Floor of intertubercular groove of humerus
A: Extends, adducts, and medially rotates humerus; raises body toward arms during climbing
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Rhomboid Major

O: vertebrae T2 - T5
I: medial border of the scapula
A: Retracts the scapula and rotates it
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Trapezius

O: C7 - T12 vertebrae
I: Lateral third of clavicle, acromion, and spine of scapula
A: Elevates, retracts and rotates scapula; superior fibers elevate, middle fibers retract, and inferior fibers depress scapula; superior and inferior fibers act together in superior rotation of scapula
Wikipedia Questions