Pectoralis Major Muscle Diagram. Epitrochlearis this is a flat thin muscle on the medial surface of the upper arm. Shoulder horizontal flexion moving the arms forwards in front of the body upwards phase of a press up.
It function is the same as the pectoralis major. Pectoralis major muscle is a thick fan shaped muscle making the bulk of chest muscle. The pectoralis major l.
The pec major is the largest and most superficial of the anterior axioappendicular muscles lying superficial to the entire pectoralis.
The pec major attaches to the humerus bone upper bone of arm and is divided into two parts. As you can see in the diagram above the horizontal sternum forms a t with the vertical keel. The two pectoralis major muscles commonly referred to as the pecs. Biceps brachii the large muscle located on inside of the upper arm.