What is the function of the pectoral muscle?

Question

To adduct the arms

Answer 1

In order to understand the function of the pectoral muscles, one must consider its origin and insertion.

The pectoralis major originates at the medial portion of the clavicle and inserts at the bicipital groove of the humerus. If you imagine a string running between these two structures that is being pulled in the direction of the origin (clavicle), you will find the arm is adducted (brought towards midline), internally rotated, and slightly flexed. Another approach if this visualization does not work for you, place your hand over the pectoralis major muscle and take your arm through various motions. You will feel that the muscle feels tightest when held in the positions mentioned above.

The pectoralis minor originates at the cartilage of ribs 3-5 and inserts at the coracoid process of the scapula. Again, imagine a string between these structures being pulled in the direction of the origin (ribs 3-5). You will find the scapula is drawn forward and downward.

Hope this helps!!

Answer 2

The pectoral muscle as numerous functions as it consists of 3 parts allowing it to have a wide variety of functions. It allows for transverse adduction , arm medial rotation, shoulder flexion,, shoulder depression and shoulder adduction.

Answer 3

The pectoral muscles will yes, move the arms but they’ll also move the shoulders and stabilize the chest and upper body!

These muscles will move the arms by flexion, internal rotation and adduction. They’ll stabilize the shoulders to by working with other muscles to stabilize them when carrying objects, lifting and pushing. They’ll move the chest to help depress and elevate the bones of the thorax which plays a good role in the process of breathing!