대흉근(pectoralis major)

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)