PECTORALIS MAJOR

Origin

Clavicular head-med half clavicle. Sternocostal head -lat manubrium and sternum, six upper costal cartilages and ext oblique aponeurosis

Action

Clavicular head:flexes and adducts arm. Sternal head: adducts and med rotates arm . Accessory for inspiration

Insertion

Lat lip of bicipital groove of humerus and ant lip of deltoid tuberosity

Nerve

Med pectoral N(from med cord) and lat pectoral N (from lat cord) (C6, 7, 8)