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Muscle structure of the chest -guy pecs

The primary component of the chest is the large muscle named Pectoralis Major. It is only one muscle of many that is used to move the shoulder girdle and manipulate the arm (above the elbow). All of the muscle fibers that make up the Pectoralis Major run from the sternum and the sternal ends of the first 7 ribs, all the way to a small bump on side of your humerus bone call the greater tubercle. If you recall from the first installment of Structure and Function about the lats, this is almost the same exact point of where our lats attach to our arm-guy pecs

As a matter of fact, the fibers that attach to the arm run over the fibers of the lattissimus muscle. All of the fibers run in one direction. It is a one way, non-stop flight from the sternum to the humerus There are no facsial divisions or tendons that would constitute the distinction of a inner or outer chest. The Pectoralis major is all one piece in a sense. There is no reason to try to find exercise that will increase the size of the inner aspect more than the outer because there aren't any exercises that can do that.

An easy way to think of this is to find a rubber band and place it between the thumb and index finger of one hand. Let's imagine that your thumb is your sternum making the part of the rubber band closest to your thumb the "Inner Chest". With that said, you can not move your thumb. Now, by only moving your index finger, I want you to try to stretch out only the part closest to your thumb. It's impossible. The entire band is going to stretch. And that is exactly how your pecs operate.

There is also a small gathering of gathering of muscle that lie underneath the Pectoralis major, that are collectively called the Pectoralis Minor. It starts from the middle of ribs 3-5 and attaches to the coracoid process that comes off of the scapula. That's because of its primary function it goes from the bottom up. Its primary function is only to depress the shoulder girdle.

This means if you to support your self on something with our your feet on the floor with your elbows locked out, the pec minor would be a player in forcing your shoulders down rather than letting them pinch your head off. It is also involved in raising ribs 3-5. In other words, when you take a deep breath and your rib cage expands. Since it does not attach to the humerus, it does not have any involvement in actually moving the arm. Keep that in mind the next time you hit the gym.-guy pecs