Logan Steele
The chest is home to a group of skeletal muscles known as the pectoral muscles. These muscles connect the front walls of the chest to the bones of the upper arm and shoulder. There are two such muscles on each side of the sternum: the pectoralis major and the pectoralis minor. The pectoralis major constitutes the bulk of the chest muscles, lying underneath the breast. The chest also contains the serratus anterior muscle, which moves the scapula forward around the torso, as when throwing a punch.
| Characteristics | Values |
|---|---|
| Name of muscles | Pectoral muscles |
| Number of muscles | 3 |
| Location | Front walls of the chest |
| Connection | Connect the front walls of the chest with the bones of the upper arm and shoulder |
| Function | Responsible for moving the upper extremities in a wide range of motion |
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What You'll Learn
The pectoralis major is the largest muscle in the chest
The chest does indeed have muscles. The pectoralis muscle is any of the muscles that connect the front walls of the chest with the bones of the upper arm and shoulder. There are two such muscles on each side of the sternum (breastbone) in the human body: the pectoralis major and the pectoralis minor. The pectoralis major constitutes the bulk of the chest muscles, lying underneath the breast.
The pectoral muscles are the group of skeletal muscles that connect the upper extremities to the anterior and lateral thoracic walls. Juxtaposed with the regional fascia, these muscles are responsible for moving the upper extremities in a wide range of motion. These include but are not limited to flexion, adduction, and internal rotation of the humerus, stabilization of the scapula, as well as elevating and depressing the bones of the thorax. The primary muscles involved in these actions include the pectoralis major, pectoralis minor, serratus anterior, and subclavius. The serratus anterior is another muscle on the front of the chest. It moves the scapula forward around the torso, as when throwing a punch.
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The pectoralis minor is another muscle in the chest
The chest does have muscles. The pectoral muscles are the group of skeletal muscles that connect the upper extremities to the anterior and lateral thoracic walls. The pectoralis minor is another muscle in the chest. It is one of two muscles on each side of the sternum (breastbone), the other being the pectoralis major. The pectoralis major constitutes the bulk of the chest muscles, lying underneath the breast. The pectoralis minor is involved in moving the upper extremities in a wide range of motions, including flexion, adduction, and internal rotation of the humerus, as well as elevating and depressing the bones of the thorax.
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The serratus anterior is a muscle on the front of the chest
The chest does have muscles, which are constantly working, especially in our modern world where we are often looking at screens or writing. The serratus anterior is a muscle on the front of the chest, which is fan-shaped and originates on the superolateral surfaces of the first to eighth or ninth ribs at the lateral wall of the thorax. It inserts along the superior angle, medial border, and inferior angle of the scapula. The main part of the serratus anterior lies deep to the scapula and the pectoral muscles and is easily palpated between the pectoralis major and latissimus dorsi muscles. In athletic individuals with a low body fat percentage, it is often visible from the skin's surface.
The serratus anterior is one of three muscles that lie in the pectoral region and exert a force on the upper limb. The other two are the pectoralis major and the pectoralis minor. The serratus anterior is the prime mover in scapular protraction and scapular upward rotation. It moves the scapula forward around the torso, as when throwing a punch. It also aids in the upward rotation of the scapula, working alongside the trapezius muscle. Upward scapular rotation is important for raising the arms up, due to tilting the glenoid cavity upward and by doing so maintaining joint alignment. When the shoulders remain in a fixed position, the serratus anterior can contribute to respiration by elevating the ribs.
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Intercostal muscles are found between the ribs and help with breathing
The chest does have muscles. Between the ribs are various groups of intercostal muscles, which help with breathing. These muscles are found between the ribs and help with the expansion and contraction of the rib cage during breathing. They also help to stabilise the chest wall and assist in forced exhalation, such as when coughing or sneezing. The intercostal muscles are innervated by the intercostal nerves, which arise from the spinal cord and provide motor and sensory function to the chest wall.
The pectoral muscles are another group of muscles that are found in the chest. These muscles connect the front walls of the chest with the bones of the upper arm and shoulder. There are two pectoral muscles on each side of the sternum (breastbone): the pectoralis major and the pectoralis minor. The pectoralis major constitutes the bulk of the chest muscles, lying underneath the breast. The serratus anterior is another muscle found on the front of the chest, which moves the scapula forward around the torso, as when throwing a punch.
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Chest muscles are constantly working in our modern world
The chest does indeed have muscles, and they are constantly working in our modern world.
The chest muscles, or pectoral muscles, are a group of skeletal muscles that connect the front walls of the chest with the bones of the upper arm and shoulder. There are two such muscles on each side of the sternum (breastbone): the pectoralis major and the pectoralis minor. The pectoralis major constitutes the bulk of the chest muscles, lying underneath the breast.
These muscles are responsible for moving the upper extremities in a wide range of motions, including flexion, adduction, and internal rotation of the humerus, stabilization of the scapula, as well as elevating and depressing the bones of the thorax. The serratus anterior, another muscle on the front of the chest, moves the scapula forward around the torso, as when throwing a punch.
In our modern world, where everything is in front of us—from our phones and laptops to the people we talk to and the things we write—our chest muscles are constantly working. They are voluntary muscles, meaning we control how they work, and they perform a range of functions and movements throughout the body. So, whether we're aware of it or not, our chest muscles are always active and playing an important role in our daily lives.
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Frequently asked questions
Yes, the chest has muscles. The pectoral muscles are the group of skeletal muscles that connect the front walls of the chest with the bones of the upper arm and shoulder.
The three muscles that lie in the pectoral region are the pectoralis major, pectoralis minor, and the serratus anterior.
The chest muscles are responsible for moving the upper extremities in a wide range of motion, including flexion, adduction, and internal rotation of the humerus, stabilization of the scapula, as well as elevating and depressing the bones of the thorax.
