“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," are the muscles that create the bulk of the chest.”
“The pectoralis minor is a thin, flat muscle found immediately underneath the pectoralis major. This is the smaller of the two pectoral muscles, or muscles of the chest.”
