What movements do the pectoralis major perform?

March 31, 2020 Off By idswater

What movements do the pectoralis major perform?

The pectoralis major extends across the upper part of the chest and is attached to a ridge at the rear of the humerus (the bone of the upper arm). 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.

What is the attachment point of musculus pectoralis major?

Attachments of Pectoralis Major Muscle: Origin & Insertion Sternal head: sternum, upper costal cartilages (1-6), and the aponeurosis of the external oblique. a. Lateral lip of the intertubercular (bicipital) groove of the humerus.

What is Bilaminar insertion of pectoralis major?

The musculotendinous anatomy is composed of 2 divisions—an anterior clavicular division and a posterior sternal-abdominal division that coalesce to form a bilaminar tendon before inserting onto the humerus.

What nerve controls the pectoralis major?

The clavicular head of the pectoralis major and the anteromedial part of the sternal head of the muscle are supplied by the lateral pectoral nerve which originates from the lateral cord of the brachial plexus.

What causes tight pec?

There are many possible causes of a tight pec minor muscle. Bad posture is certainly at the top of the list for most people. However, direct trauma to the chest, stress, prolonged use of crutches, or a heavy backpack carried over the shoulder will also do the trick.

Why do my pec muscles hurt?

Chest wall pain that is caused by a strained or pulled muscle often happens as a result of overuse. You may have lifted something heavy or injured yourself playing sports. For example, gymnastics, rowing, tennis, and golf all involve repetitive motion and may cause chronic strains.

How does the pec major extend the arm?

The main function of this chest muscle as a whole is the adduction and internal rotation of the arm on the shoulder joint. Acting independently, the clavicular part helps to flex the extended arm up to 90°, while the sternocostal part facilitates the extension of the flexed arm by pulling it downwards.

What are the symptoms of a torn pectoral muscle?

When the pectoralis muscle ruptures, you will have sudden severe pain and a tearing sensation in the chest. You may also have pain in the upper arm, weakness, bruising, and a dimpling, or pocket formation above the arm pit.

Can a torn pectoral muscle heal itself?

In most cases, a torn pectoral will not heal on its own. Our team will need to perform surgery to reattach the muscle so that you can begin your road to recovery. The operation will involve sewing the muscle back into place on your upper arm.

What kind of muscle is the pectoralis major?

The pectoralis major muscle is a large fan-shaped muscle of the pectoral region, overlying the anterior chest wall but often considered an upper limb muscle due to its function. Pectoralis major is a large, fan-shaped muscle.

What causes the pectoralis major to be absent?

Poland syndrome is a congenital anomaly in which there is a malformation of the chest causing the pectoralis major on one side of the body to be absent.

How are the two heads of the pectoralis major tested?

The two heads of pectoralis major muscle can be tested separately: The clavicular head of pectoralis major can be tested by transversely adducting the arm at the glenohumeral joint against resistance, during which It can be seen and palpated.

How are the pectoralis muscles connected to the humerus?

The 2 pectoralis muscles, the pectoralis major and the pectoralis minor (the larger and smaller muscles of the chest) connect the front of the chest wall with the humerus (upper arm bone) and shoulder ( Fig ). The pectoralis major is a thick, fan-shaped muscle consisting of 2 heads or portions, the clavicular and the sternal.