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The pectoral muscles are a group of skeletal muscles that attach the upper limbs to the front and sides of the thoracic wall. They are responsible for a wide range of arm movements and play a vital role in stabilizing the shoulder girdle. The pectoral region is located on the anterior chest wall and contains four muscles: the pectoralis major, pectoralis minor, serratus anterior, and subclavius. The pectoralis major is the largest and most superficial muscle in the chest area, arising from parts of the clavicle and sternum, while the pectoralis minor lies underneath and aids in drawing the shoulder forward and downward. The serratus anterior is a fan-shaped muscle located between the rib cage and the scapula, and the subclavius is a small muscle located directly underneath the clavicle. These muscles are essential for upper body strength and stability, enabling us to perform daily tasks such as pushing a door or lifting a bag.
| Characteristics | Values |
|---|---|
| Location | Anterior chest wall |
| Muscle Group | Pectoral region |
| Number of Muscles | 4 |
| Muscle Names | Pectoralis major, pectoralis minor, serratus anterior, subclavius |
| Muscle Functions | Shoulder movement, flexion, adduction, internal rotation of the humerus, stabilization of the scapula, elevation and depression of the bones of the thorax |
| Muscle Shapes | Fan-shaped, triangle-shaped |
| Muscle Sizes | Thick, large, small |
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What You'll Learn
The pectoralis major
The primary functions of the pectoralis major are flexion, adduction, and internal rotation of the humerus at the shoulder joint. The clavicular part helps to flex the extended arm up to 90 degrees, while the sternocostal part facilitates the extension of the flexed arm by pulling it downwards. The pectoralis major also assists in breathing when the diaphragm and intercostal muscles are insufficient.
In rare cases, individuals may be born with Poland Syndrome, a congenital condition characterised by the absence of the pectoralis major muscle, typically on one side of the body. This condition may also be accompanied by the absence of the breast in females.
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The pectoralis minor
The absence of the pectoralis minor muscle is uncommon but can occur in rare diseases such as Poland Syndrome.
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The serratus anterior
The muscle consists of several strips, which originate from the lateral aspects of ribs one to eight or nine. They attach to the costal (rib-facing) surface of the scapula. The serratus anterior is divided into three parts: the superior, middle, and inferior. The superior part involves the first to second rib attaching to the superior angle of the scapula. The middle part involves the second to third rib attaching to the medial border of the scapula. The inferior part involves the fourth to eighth or ninth rib attaching to the medial border and inferior angle of the scapula.
The vascular supply to the serratus anterior comes from the superior and lateral thoracic arteries (branches of the axillary artery) and branches from the thoracodorsal artery (branch of subscapular artery). The serratus anterior is innervated by the long thoracic nerve, a branch of the brachial plexus.
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The subclavius
The main function of the subclavius is to stabilize the clavicle and control its mobility during movements of the shoulder and arm. Its contraction leads to a depression of the sternal end of the clavicle and subsequent elevation of the first rib. This helps to prevent injuries to the adjacent neurovascular structures in cases of clavicular fracture or other trauma.
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Common exercises
The pectoral muscles are the group of skeletal muscles that connect the upper extremities to the anterior and lateral thoracic walls. These muscles are responsible for a wide range of movements of the upper extremities. The primary muscles involved in these actions include the pectoralis major, pectoralis minor, serratus anterior, and subclavius.
Bench Press
The bench press is a compound exercise that helps in strengthening the chest muscles. It involves moving weights up and down without crossing the midline of the chest. This exercise can be performed using a barbell or dumbbells.
Incline Bench Press
The incline bench press is a variation of the traditional bench press that targets the upper pecs. It involves lying on an inclined bench and pushing weights away from the body.
Dips
Dips are another compound exercise that can be performed using parallel bars or gymnastic rings. They target the chest, triceps, and shoulders.
Push-ups
Push-ups are a bodyweight exercise that can be performed anywhere. They target the chest, triceps, and shoulders. For an easier variation, one can perform push-ups from their knees instead of the toes.
Dumbbell Flyes
Dumbbell flyes are an exercise that targets the chest muscles by moving the weights across the midline of the body. They help in achieving full extension and stretching the chest muscles.
Cable Crossovers
Cable crossovers are another exercise that involves moving the hands and weights across the midline of the body. They help in targeting the chest muscles from different angles.
These exercises can be incorporated into a workout routine to effectively target the pectoral muscles and promote growth and development. It is recommended to aim for pec workouts twice a week, balancing training and recovery.
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Frequently asked questions
Your pectoral muscles are located on the anterior chest wall.
The pectoral muscles are a group of skeletal muscles that attach your upper limbs to the front and sides of the thoracic wall.
There are four pectoral muscles: pectoralis major, pectoralis minor, serratus anterior, and subclavius.
The pectoralis major is the largest and most superficial muscle in the chest area.
