pectoralis major strain test

What is Pectoralis major muscle strain? Where is the Pectoralis major muscle located? Origin:Clavicular part: anterior surface of sternumSternocostal part: the first 7 costal cartilages, the sternal end of the sixth ribAbdominal part: the aponeurosis of the external oblique of the anterior abdominal wall Insertion:Crest of the greater tubercle sulcus of the humerus Action:Shoulder joint:…