Your pectoralis major is a large and powerful chest muscle that’s shaped like a fan. It starts from two sections: your breastbone (sternum) and your collarbone (clavicle). The two sections come ...

BALTIMORE – A torn pectoralis major muscle, or pec muscle, is a serious injury striking boxers, pro wrestlers, body builders and even a growing number of military servicemen. It's a condition that ...

The pectoralis major muscle is a large muscle in the upper chest, fanning across the chest from the shoulder to the breastbone. The two pectoralis major muscles, commonly referred to as the ‘pecs,’ ...