1. Pectoralis Major - Sternal Head Origin Sternum, aponeurosis of external oblique and ribs 2-6 Insertion Lateral lip of intertubercular/bicipital groove of humerus Action - Horizontal shoulder flexion
- Medial shoulder rotation
- Shoulder adduction
- Shoulder extension
2. Pectoralis Major - Clavicular Head Origin Anterior surface of medial half of clavicle Insertion Lateral lip of intertubercular/bicipital groove of humerus Action - Horizontal shoulder flexion
- Medial shoulder rotation
- Shoulder adduction
- Shoulder flexion
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