PECTORALIS MAJOR
| ORIGIN Clavicular head-medial half clavicle. Sternocostal head-lateral manubrium and sternum, six upper costal cartilages and external oblique aponeurosis |
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| INSERTION Lateral lip of bicipital groove of humerus and anterior lip of deltoid tuberosity |
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| ACTION Clavicular head:flexes and adducts arm. Sternal head: adducts and medially rotates arm . Accessory for inspiration |
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| NERVE Medial pectoral nerve (from medial cord) and lateral pectoral nerve (from lateral cord) (C6, 7, 8) |