What Is The Action Of The Pectoralis Major Muscle
Camila Farah
It s innervated by both medial and lateral pectoral nerves.
This means that pec major can create opposite actions depending on the circumstances. These muscles help pull your arm across the front of your body. A developed pectoralis major is most evident in males as the breasts of a. Actions and functions one of the major functions of the pectoralis major muscle is production of movements particularly in the shoulder joints.
What actions does the pectoralis major do. The pectoral region is located on the anterior chest wall. Fiber direction from origin to insertion is important in understanding how this muscle creates its actions. One of the action is flexion of the humerus long bone of the upper arm and this is demonstrated by moving a straight arm forward.
Pectoralis major is a thick fan shaped muscle contributing to the thoracobrachial motion. These large muscles help you move your shoulder. It can create a number of actions including. It consists of a clavicular part and a sternal part both converging to a flat tendon that inserts on the humerus.
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Of these two chest muscles the pectoralis major comprises the bulk of the pectoral muscle while the pectoralis minor is a thin triangular shaped muscle found underneath the pectoralis major. When acting from the humeral attachment the pectoralis major muscle also facilitates the act of inspiration. The pectoralis major is superficial making it easy to see and feel palpate. Pectorals provide range of motion to the arms and facilitate actions such as pushing or pulling with the arms and raising or lowering the shoulder.
The two pectoralis major muscles commonly referred to as the pecs are the muscles that create the bulk of the chest. There are four basic actions of the shoulder joints. It contains four muscles that exert a force on the upper limb. It assists in adduction.
The pectoralis major muscle contributes to pain in the chest shoulder breast and upper back. The origin of pectoralis is broad and its insertion is small. Its major actions are adduction or depression of the arm in opposition to the action of the deltoideus muscle and rotation of the arm forward about the axis of the body. This action is important in activities such as climbing.
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