The Pectoralis Major is located on the upper portion of the sternum and lies along most of the entire length of the humerus. It works to move forelimb towards the chest. To isolate the muscle:
-Remove any connective tissue on the chest area near the upper forelimb.
-The muscle lies extensively and the striations of the flap of muscle are relatively easy to see.
-The Pectoralis Major will have to be cut and reflected in order to examine the underlying muscle.