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Muscle of the Week
Pectoralis major

Origin
Clavicular head: anterior surface of medial half of clavicle
Sternocostal head: anterior surface of sternum, superior six costal cartilages, and aponeurosis of external oblique muscle

Insertion
Lateral lip of intertubercular groove of humerus

Action
Adducts and medially rotates humerus; draws scapula anteriorly and inferiorly

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Copyright 2007
Michael D Gottlieb
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