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The trapezius muscle is a large, triangular, paired muscle located on the posterior aspect of the neck and thorax. It is involved in several actions, including movement of the head, neck, and shoulder girdle, as well as maintaining and adjusting posture. The trapezius muscle has three sections: descending (superior), ascending (inferior), and middle. The upper trapezius elevates the shoulders, while the lower trapezius depresses the scapula, and the middle trapezius retracts the scapula. Together, the upper and lower trapezius also assist in rotating the scapula upward. The trapezius muscle works in conjunction with other muscles to enable a wide range of movements and is an important muscle for posture and shoulder and arm movement.
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What You'll Learn
Trapezius muscles help with posture and movement
The trapezius muscle is a large, triangular, paired muscle located on the posterior aspect of the neck and thorax. When viewed together, this pair forms a diamond or trapezoid shape, extending from the base of the neck down to the middle of the back. The trapezius is involved in various functions related to posture and movement.
One of the primary roles of the trapezius muscle is to stabilize and control the scapula (shoulder blade) during movements of the shoulder and upper limb. The upper fibres of the trapezius elevate the scapulae, the middle fibres retract them, and the lower fibres depress them. This coordination ensures smooth neck and shoulder movements. The trapezius also assists in the downward rotation of the scapula, working with muscles like the latissimus dorsi and serratus anterior.
The trapezius muscle is crucial for maintaining and adjusting posture. It helps prevent excessive kyphotic (rounding) of the upper back, often experienced by those who sit at a desk or drive for extended periods. The trapezius also plays a role in extending, tilting, and rotating the neck, allowing for head movements such as turning the head to either side and tilting it to the same side as the contracted muscle.
In addition to its role in posture and movement, the trapezius is involved in active movements such as side bending, twisting the torso, shrugging the shoulders, and internally rotating the arm. It is also an accessory breathing muscle, helping to open up a small amount of breathing room in the upper chest area.
Overall, the trapezius muscles are essential for the range of motions we perform daily, from simple head turns to more complex movements involving the shoulders and arms.
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They are involved in neck and head movement
The trapezius muscle is a large, triangular, paired muscle located on the posterior aspect of the neck and thorax. When viewed together, this pair forms a diamond or trapezoid shape. The muscle has many attachment points, extending from the skull and vertebral column to the shoulder girdle.
The trapezius muscles are important for posture as well as shoulder and arm movement. They help you move your head, neck and upper back, and maintain and adjust your posture. They are involved in neck and head movement, including tilting, turning and extending the neck, and keeping the shoulder blades down the back. The upper trapezius, the part that goes across the tops of the shoulders, can elevate or bring up the shoulder girdle. It also helps extend, tilt, and rotate the neck, which has the effect of bringing the head back, to the side, and turning it. The rotation function takes the head to the opposite side of where the neck and shoulder muscle is located.
The upper trapezius is frequently involved in neck injuries. It has a clear pain referral pattern to the head, so it is important to consider this when assessing for cervicogenic headaches. Tearing or straining the trapezius is uncommon, usually only happening in bodybuilders lifting too heavy a weight. However, in high-velocity accidents, such as a car crash, the trapezius can be damaged.
When the muscle is acting unilaterally, the descending fibres produce an ipsilateral lateral flexion of the head and neck by acting on the atlanto-occipital joint and upper cervical vertebrae, respectively. Unilateral contraction may also result in a contralateral rotation of the head at the atlantoaxial joint. Bilateral contraction of the descending part of the trapezius (i.e. when both left and right muscles contract) causes an extension of the head and neck.
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They are important for shoulder and arm movement
The trapezius muscle is important for shoulder and arm movement. It is a large, triangular, paired muscle located on the posterior aspect of the neck and thorax. When viewed together, this pair forms a diamond or trapezoid shape, extending from the skull and vertebral column to the shoulder girdle. The main function of the trapezius is to stabilize the scapula in its anatomical place and control it during movements of the shoulder and upper limb.
The upper trapezius muscle is responsible for elevating the scapulae, while the lower trapezius muscle depresses the scapulae. The middle trapezius helps bring the shoulder blades back towards the spine. The upper and lower trapezius muscles also work together to rotate the scapula upward, which occurs when you lift your arm to the side. This movement is important for activities that require lifting the arms above shoulder height, such as throwing or reaching.
The trapezius muscle is involved in the scapulohumeral rhythm, which is the coordination of the scapula and humerus during arm movements. It assists in abduction of the shoulder above 90 degrees by rotating the glenoid upward. The trapezius also works with other muscles, such as the deltoid and rotator cuff muscles, during throwing actions.
In addition to its role in shoulder and arm movement, the trapezius muscle is also involved in neck movements. It helps with side bending, tilting, and turning the head, as well as extending and rotating the neck. The trapezius muscle is also important for maintaining and adjusting posture, including standing up straight or bending the upper back forward.
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They are the most superficial of the extrinsic muscles of the back
The trapezius muscle is the most superficial of the extrinsic muscles of the back. It is a large, triangular, paired muscle that forms a diamond or trapezoid shape when viewed together. These muscles are located on the posterior aspect of the neck and thorax, extending from the skull and vertebral column to the shoulder girdle. The trapezius has a broad, flat, and superficial structure, with an extensive origin that surpasses that of any other body muscle. Its unique shape and position make it crucial for various movements and functions.
The trapezius muscle has multiple functions, including stabilizing and moving the scapula, controlling the scapula during shoulder movements, and assisting in arm elevation. The upper fibres of the trapezius elevate the scapulae, while the lower fibres depress them, and the middle fibres retract the scapulae. This muscle also plays a role in scapular rotation, ensuring smooth and efficient shoulder movements. Additionally, the trapezius contributes to the scapulohumeral rhythm through its attachments to the clavicle and scapula.
The trapezius muscle is also involved in head and neck movements. When acting unilaterally, the descending fibres produce a lateral flexion of the head and neck, while unilateral contraction can result in contralateral rotation of the head. Bilateral contraction of the descending part of the trapezius causes an extension of the head and neck. Furthermore, the trapezius muscle is essential for maintaining and adjusting posture, including standing up straight or bending the upper back forward.
The trapezius muscle is susceptible to various issues and injuries, such as muscle spasms, cramps, strains, and nerve damage. Common causes of trapezius muscle pain include overuse, injuries, and nerve damage. Slouching or slumping can also put extra tension on the trapezius, leading to misalignment and chronic tightness. Stress can indirectly affect the trapezius by causing unconscious muscle tension in the shoulders, upper back, and neck.
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They are involved in scapular translation and rotation
The trapezius muscle is a large, triangular, paired muscle located on the posterior aspect of the neck and thorax. It is involved in scapular translation and rotation, which are crucial for optimal shoulder joint function.
The main function of the trapezius muscle is to stabilize the scapula in its anatomical place and control it during movements of the shoulder and upper limb. The upper fibres of the trapezius elevate the scapulae, while the lower fibres depress the scapulae, and the middle fibres retract the scapulae. Together, the upper and lower fibres also assist the middle fibres in scapular retraction and adduction.
The trapezius muscle helps rotate the scapula around an axis that runs anteroposteriorly through the base of the scapular spine. This rotation of the scapula allows for smooth arm elevation, ensuring efficient shoulder movement during activities such as pushing or punching. The trapezius also assists in the abduction of the shoulder by rotating the glenoid upward.
In addition to its role in scapular translation and rotation, the trapezius muscle is involved in various other movements. It aids in head and neck movements, such as side bending, tilting, turning, and extending the neck. The trapezius also helps maintain and adjust posture, including standing up straight or bending the upper back forward.
The trapezius muscle is susceptible to injuries, such as muscle strains, nerve damage, or tears, which can cause pain, limited mobility, and decreased range of motion. Maintaining flexibility and strength through exercises like yoga, Pilates, and shoulder stretches can help prevent issues with the trapezius muscle.
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Frequently asked questions
The trapezius muscles are two large, flat muscles on either side of the upper back. They are involved in many movements of the head, neck, and shoulder girdle, and are important for maintaining and adjusting posture.
The trapezius muscle is divided into three parts: descending (superior), ascending (inferior), and middle. The upper trapezius elevates the scapulae, the middle trapezius retracts the scapulae, and the lower trapezius depresses the scapulae. The upper and lower trapezius also work together to rotate the scapula upward.
Injury to the trapezius muscle can cause pain, limited movement, and a loss of neck flexibility. Tearing or straining the trapezius is uncommon, usually only occurring in bodybuilders lifting too heavy a weight or in high-velocity accidents such as car crashes.
