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Origin: medial half of clavicle, lateral margin of sternum, costal cartilidges 1-7, aponeurosis of external oblique

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Insertion: lateral lip of intertuberal groove of humerus

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Action: flexes, adducts, and medially rotates humerus "hugging muscle"

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Origin: vertebrae T7-L5, lower 3-4 ribs, iliac crest, thoracolumbar fascia

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Insertion: floor of intertuberlar groove of the humerus

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Action: extends, adducts, and medially rotates humerus "handcuff muscle"

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Origin: acromion and spine of scapula, clavicle

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Insertion: deltoid tuberosity of humerus

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Action: flex and medially rotate humerus, abduct humerus, extend and laterally rotate humerus

Origin: Supraspinous fossa of scapula

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Insertion: greater tubercle of humerus

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Action: abduction of humerus

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Origin: infraspinous fossa of scapula

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Insertion: greater tubercle of humerus

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Action: rotates humerus laterally

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Origin: inferior angle of scapula

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Insertion: medial lip of intertubercular groove of humerus

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Action: extends and medially rotates humerus

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Origin: lateral border and adjacent posterior surface of scapula

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Insertion: greater tubercle of humerus

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Action: rotates humerus laterally

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Origin: subscapular fossa of scapula

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Insertion: lesser tubercle of humerus

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Action: rotates humerus medially

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Origin: coracoid process of the scapula

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Insertion: medial aspect of humeral shaft

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Action: flexes and medially rotates humerus

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