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The trapezius muscle, commonly referred to as the traps, is a large muscle in the upper back that is responsible for a variety of movements, including those of the head, neck, and shoulders. It is also important for maintaining posture and preventing neck and spine injuries. The trapezius muscle has three sections – upper, middle, and lower – that work together to perform functions such as scapular retraction, shoulder abduction, and arm elevation. The upper trapezius elevates the scapulae, while the lower trapezius brings the shoulder girdle down, performing opposite actions. The trapezius muscle works in conjunction with and opposes several other muscles, including the rhomboids, levator scapulae, deltoid, and pectoralis minor.
| Characteristics | Values |
|---|---|
| Muscle pairings | Rhomboids, Levator Scapulae, Deltoid, Pectoralis Minor, Latissimus Dorsi, Supraspinatus, Serratus Anterior |
| Function | Stabilize and move the scapula, retract and stabilize the scapula, assist in downward rotation of the scapula, assist in abduction of the shoulder, assist in breathing |
| Location | Upper back, on either side of the spine |
| Shape | Trapezoid, diamond-shaped quadrilateral |
| Sections | Upper, Middle, Lower |
| Nerve | Accessory nerve, Cranial nerve XI, C3 and C4 cervical nerves |
| Artery | Occipital artery, Superficial cervical artery, Dorsal scapular artery |
| Dysfunction | Winged scapula, trapezius palsy, neck pain, poor scapular control |
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What You'll Learn
The trapezius and rhomboids oppose each other
The trapezius muscle has three sections: upper, middle, and lower. The upper trapezius elevates the scapulae, while the middle fibres retract the scapulae, and the lower fibres depress the scapulae. The lower trapezius stabilises the spine by bringing the shoulder girdle down, which is the opposite function of the upper trapezius.
The rhomboids, on the other hand, consist of the rhomboid major and minor muscles. They work closely with the trapezius muscles to retract and stabilise the scapula, which is essential for shoulder movement and posture. While the trapezius muscles lift the scapulae, the rhomboids assist in the downward rotation of the scapula, creating a balanced and coordinated movement. This opposition between the trapezius and rhomboid muscles ensures smooth and controlled scapular retraction and elevation during activities such as rowing or pulling motions.
Additionally, the rhomboids are part of the superficial layer of extrinsic back muscles, along with the trapezius. The rhomboids lie beneath the trapezius, contributing to the complex anatomy of the back and shoulder region. This anatomical arrangement further highlights the opposing nature of the trapezius and rhomboid muscles, as they work in tandem to facilitate a wide range of movements and maintain structural stability.
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Trapezius and levator scapulae oppose each other
The trapezius muscle is a large muscle in the upper back, with two sections on either side of the body. The muscle is involved in many motions, including turning the head, adjusting posture, twisting the torso, shrugging the shoulders, and moving the shoulder when lifting the arm. The upper fibres elevate the scapulae, the middle fibres retract the scapulae, and the lower fibres depress the scapulae.
The levator scapulae is a slender skeletal muscle situated at the back and side of the neck. It originates from the transverse processes of the four uppermost cervical vertebrae and inserts onto the upper portion of the medial border of the scapula. Its main function is to elevate the scapula. It often works in combination with other muscles like the rhomboids and pectoralis minor to produce downward rotation of the scapula.
The trapezius and levator scapulae oppose each other. When the levator scapulae rotates the scapula downward, the trapezius works in opposition to produce upward rotation. The levator scapulae elevates the scapula and rotates its inferior angle medially. The trapezius elevates the scapulae and rotates the glenoid upward. The levator scapulae also acts with the trapezius, latissimus dorsi, rhomboids, pectoralis major, and pectoralis minor muscles to stabilise the spine and extend and laterally flex the neck.
The trapezius muscle resembles a trapezium or diamond-shaped quadrilateral. It is one of the commonly affected muscles in facioscapulohumeral muscular dystrophy (FSHD). The levator scapulae is a large, superficial muscle of the upper back and neck. It may be stretched by rotating the neck and shoulder in various stretches, which can alleviate neck and shoulder pain.
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Trapezius and deltoid work together for arm elevation
The trapezius muscle is one of the commonly affected muscles in facioscapulohumeral muscular dystrophy (FSHD). The muscle is located in the upper back, with two large muscles on either side of the back, running from the base of the neck down to the middle of the back. The trapezius muscle works in conjunction with several other muscles to produce coordinated movements, primarily involving the scapula.
The deltoid muscle is the primary muscle for shoulder abduction and works closely with the trapezius for arm elevation. The trapezius muscle resembles a trapezium or diamond-shaped quadrilateral. The upper trapezius is frequently involved in neck injuries and pain. The trapezius muscle has three sections: upper, middle, and lower. The upper fibres elevate the scapulae, the middle fibres retract the scapulae, and the lower fibres depress the scapulae.
During shoulder abduction, the deltoid initiates the movement, while the trapezius stabilises and rotates the scapula to allow a full range of motion. This collaboration ensures smooth and powerful arm elevation, making the deltoid essential for lifting the arm in all planes. The supraspinatus also works closely with the upper trapezius to initiate the first 15 degrees of shoulder abduction, providing the necessary lift for arm elevation. It stabilises the shoulder joint, allowing smooth arm movement, especially during lifting or overhead activities.
The serratus anterior also works in conjunction with the lower trapezius to rotate the scapula upward during arm elevation, allowing the arm to lift smoothly above shoulder height. This coordination is essential for maintaining proper shoulder mechanics. The trapezius and deltoid muscles work together to ensure smooth and powerful arm elevation, with the deltoid initiating the movement and the trapezius providing stability and rotation.
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Trapezius and pectoralis minor work together to stabilise the scapula
The trapezius is a broad, flat, superficial muscle that extends from the cervical to the thoracic region on the posterior aspect of the neck and trunk. It is divided into three sections—descending (superior), ascending (inferior), and middle—and is responsible for several functions, including maintaining and adjusting posture, turning the head, twisting the torso, shrugging the shoulders, and moving the shoulder and upper back.
The pectoralis minor is a superficial muscle located on the anterior aspect of the chest or thoracic wall, beneath the pectoralis major. It is triangular in shape and is responsible for several functions, including the movement and stabilisation of the scapula.
The pectoralis minor assists the trapezius in stabilising the scapula by drawing it forward and downward against the thoracic wall. This muscle is crucial during movements that involve pushing, reaching forward, or pulling down, as it helps maintain scapular stability, allowing the shoulder to move efficiently during various activities. For example, during shoulder abduction, the deltoid muscle initiates the movement, while the trapezius stabilises and rotates the scapula to allow a full range of motion. This collaboration ensures smooth and powerful arm elevation, making the deltoid essential for lifting the arm in all planes.
Additionally, the trapezius and pectoralis minor work together with other muscles to produce coordinated movements involving the scapula. For instance, the rhomboids (major and minor) work closely with the trapezius to retract and stabilise the scapula, playing a key role in shoulder movement and posture. The levator scapulae also elevates the scapula and works with the upper trapezius to lift and rotate the shoulder. This coordination ensures smooth, controlled retraction and elevation during actions such as rowing or pulling motions.
Overall, the trapezius and pectoralis minor muscles play crucial roles in stabilising the scapula and enabling smooth and efficient shoulder movements. Their collaboration with other muscles ensures optimal shoulder function and helps facilitate various physical activities.
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Trapezius and latissimus dorsi work together for scapular rotation
The trapezius muscle, also known as the "trap" muscle, is a large muscle in the upper back that helps with various movements of the head, neck, and back, as well as maintaining posture. The muscle resembles a diamond-shaped quadrilateral or a kite, with three sections: upper, middle, and lower. The upper and lower fibres of the trapezius work together to produce a rotation of the scapula.
The latissimus dorsi is another broad, flat muscle of the upper back. Along with the trapezius, it is one of the most superficial extrinsic back muscles. The latissimus dorsi aids in shoulder adduction, extension, and internal rotation, providing stability and strength during arm and shoulder movements.
The trapezius and latissimus dorsi work together during scapular rotation, particularly in downward rotation. The trapezius is responsible for elevating the scapulae, while the latissimus dorsi depresses the scapulae. This coordinated action ensures smooth and controlled scapular movement during activities such as pulling, rowing, or swimming.
The downward rotation of the scapula is also facilitated by the force of gravity, as well as the assistance of other muscles such as the levator scapulae, rhomboids, and pectoralis major and minor. This downward rotation is crucial for full-functional upper extremity movement, allowing activities such as pushing, reaching forward, or pulling down.
In summary, the trapezius and latissimus dorsi muscles collaborate to produce coordinated scapular movements, with the trapezius elevating and the latissimus dorsi depressing the scapula, resulting in a downward rotation. This downward rotation is further enhanced by gravity and the action of other muscles, enabling a full range of motion in the upper extremities.
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Frequently asked questions
The trapezius muscles, commonly referred to as traps or trap muscles, are two large muscles found on either side of the upper back. They are responsible for maintaining and adjusting posture, as well as facilitating movement in the head, neck, and upper back.
The trapezius muscles help with various movements, including turning the head side to side, twisting the torso, shrugging the shoulders, and moving the shoulders and arms. They also provide stability to the scapula (shoulder blade) and spine.
The trapezius muscles work in conjunction with several other muscles, including the rhomboids, levator scapulae, deltoid, and pectoralis minor. During certain movements, such as shoulder abduction, the trapezius muscles oppose the levator scapulae and rhomboids, which effect downward rotation of the scapula.
