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The chest muscles, also known as pecs, are some of the largest muscle groups in the upper body. They are responsible for moving the arms across the body and up and down, as well as other movements like flexion, adduction, and rotation. The chest muscles are made up of two main muscles: the pectoralis major and the pectoralis minor. The pectoralis major is the larger of the two and is responsible for the flexion, extension, and internal rotation of the humerus, the long bone of the upper arm. The pectoralis minor lies beneath the pectoralis major and helps to stabilize the scapula, the large bone of the shoulder. Together, these muscles provide the foundation for many moves needed in daily activities and various exercises and athletics.
| Characteristics | Values |
|---|---|
| Common name | Pecs |
| Muscle groups | Pectoralis major, pectoralis minor, subclavius, serratus anterior |
| Muscle shape | Thick, fan-shaped or triangular convergent |
| Muscle size | Pectoralis major is the largest muscle in the chest |
| Muscle location | Under the breast |
| Muscle function | Flex, extend, and rotate the humerus, the long bone of the upper arm |
| Muscle movement | Adduction, flexion, and rotation of the arms |
| Muscle exercise | Push-ups, dumbbell presses, bench presses |
| Muscle injury | Tendonitis, torn pectoralis major tendon, tightness, overuse |
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What You'll Learn
The pectoralis major
The main function of the pectoralis major is the adduction and internal rotation of the arm in the shoulder joint. It assists in flexion of the arm (via its clavicular head) and extension of the arm (via the sternocostal head) at the glenohumeral joint. The pectoralis major also assists in breathing by helping to pull the trunk forwards or upwards when its humeral attachment is fixed. This action is important in activities such as climbing.
Injury to the pectoralis major is rare but can occur, especially in weight lifters performing exercises such as the bench press. Pectoralis major tendon rupture is a rare shoulder injury that is being seen more regularly due to the increased emphasis on healthy lifestyles. Another rare condition is Poland syndrome, a rare congenital condition in which the whole muscle is missing, usually on one side of the body.
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The pectoralis minor
The primary nerve supply to the pectoralis minor comes from the medial pectoral nerve, with additional innervation from the lateral pectoral nerve via a communicating branch known as the 'ansa pectoralis'. The vascular supply to the pectoralis minor comes from several sources, including branches of the axillary artery and its tributaries.
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Chest muscle injuries
The chest muscles, or pecs, are made up of four muscles that provide movement to the upper limbs and ribs. The two main muscles are the pectoralis major and pectoralis minor. The pectoralis major is a thick, fan-shaped muscle that makes up the bulk of the chest muscle and lies under the breast. The pectoralis minor is a thin, triangular muscle located beneath the pectoralis major. It attaches to the ribs and helps to stabilise the scapula, or shoulder blade.
Tears to the pectoralis major can be small and partial or a complete rupture, and can be classified as one of three grades, with grade 3 representing the most extensive damage. Bruising, swelling, and deformity of the chest and upper arm are common symptoms, as well as pain and loss of strength. Ultrasound and MRI scans can be used to diagnose the injury and determine its extent.
The treatment for a pectoralis major injury depends on the severity of the injury, the extent of muscle function loss, and the patient's health and activity level. Minor injuries and injuries in elderly patients are often treated with pain medication and physical therapy, while more severe ruptures in younger, athletic patients may require surgery to restore function. Initial management of minor injuries typically includes immobilisation, rest, and cold therapy, followed by strengthening and stretching exercises.
To prevent chest muscle injuries, it is important to maintain proper posture and incorporate a well-rounded strength-training routine into your exercise regimen. Stretching the chest muscles can also help to prevent injury and improve recovery.
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Chest muscle exercises
The chest muscles, or pecs, are important for everyday activities such as pushing open a door, pushing a grocery cart, or lifting a child up from the floor. They also help with swinging a golf club, tennis racquet, or baseball bat. Strong chest muscles are also crucial for good posture and can reduce the risk of shoulder injury.
There are four muscles in the chest region that provide movement to the upper limbs or ribs. The pectoralis major is a thick, fan-shaped muscle that makes up the bulk of the chest muscle. The pectoralis minor is a thin, triangular muscle located beneath the pectoralis major. It helps pull the shoulder forward and down. The subclavius muscle forms the armpit and moves the shoulder downward and forward. The serratus anterior is located at the side of the chest wall and is used when lifting weights overhead.
To strengthen the chest muscles, you can perform exercises such as push-ups, bench presses, and chest flies. Push-ups can be made more challenging by placing your toes on an elevated surface such as a bench or table. To perform a chest fly, lie on a flat bench holding a pair of dumbbells directly above your chest with your palms facing forward. Slowly lower the weights to the sides of your chest, keeping your elbows close to your body, pause, and then push the weights back up to the starting position.
To stretch the chest muscles, stand in a doorway and put your arms in a "field goal" position with your shoulders elevated to 90 degrees. Gently press one or both arms into the door frame, feeling a stretch across your chest and shoulders. You can also place a foam roller on the floor and lie on top of it facing up, with your head resting on the roller. Bend your knees for stability and comfort, and shift your arms out to a T position. Gravity will gently pull your arms down, allowing a gentle chest stretch.
In addition to exercise, diet is also important for building muscle. Protein is the building block of muscle, and it is recommended to consume between 1.6-2.2 g/kg of body weight for those participating in resistance training. Carbohydrates are also important, especially before and after exercise.
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Functions of the chest muscle
The chest includes some of the body's most prominent muscles, which are constantly at work. The chest muscles are responsible for moving the arms across the body and up and down, as well as other movements like flexion, adduction, and rotation.
The chest muscles connect the front of the chest with the bones of the upper arm and shoulder. The pectoralis major and pectoralis minor, known as the "pecs", are the two mighty muscles on both sides of the chest. The pectoralis major is the larger muscle, making up the bulk of the chest muscle, and has two parts: the upper portion (clavicular head) and the lower portion (sternal head). The pectoralis minor is a small, triangular muscle that lies beneath the pectoralis major.
The pectoralis major's primary function is to flex, extend, and rotate the humerus, the long bone of the upper arm. It moves each shoulder joint in four distinct directions and keeps the arms attached to the body. The upper portion of the pectoralis major helps with the above actions and works to flex the humerus (raising your arm forward). The pectoralis minor helps depress (pull down) and spread apart the shoulder blades, and can assist with breathing.
The chest muscles are essential to many of the body's functions and are used all day long, whether pushing open a door, washing your hair, or simply maintaining good posture. It is important to keep these muscles strong for daily activities such as lifting and holding, and to prevent injury.
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Frequently asked questions
The chest muscles, also known as pecs, are the muscles that connect the front of the human chest with the bones of the upper arm and shoulder.
There are two main types of chest muscles: the pectoralis major and the pectoralis minor, known collectively as the pecs. The pectoralis major is the larger muscle and makes up the bulk of the chest muscle. The pectoralis minor is a thin, triangular muscle located beneath the pectoralis major.
The main function of the chest muscles is to help you bring your arms closer to your body with strength and control. They also help stabilise the shoulders, lift the arms, and maintain proper posture. The chest muscles are involved in essential functions you need throughout the day and provide the foundation for many moves you need in a variety of exercises and athletics.
There are various exercises that can help strengthen your chest muscles, including the classic push-up, bench press, incline press, and parallel bar dips. It is important to incorporate a variety of chest exercises into your routine to target different muscle fibres and maximise strength and size gains.
To stretch your chest muscles, you can try the following: stand in a door frame with your arms in a "field goal" position and gently press your arms into the frame. Alternatively, place a foam roller on the floor and lay on top of it facing up, with your head resting on the roller. Bend your knees and shift your arms out to a "T" position, allowing gravity to gently pull your arms down.
