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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 Click for More PickinChickin Copyright 2007 Michael D Gottlieb comments |
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