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The trapezius muscle is a large, paired, triangular muscle located on the back of the neck and upper back. It is involved in several important functions, including maintaining posture, moving the head, neck, and shoulder, and lifting the arms. The trapezius muscle is divided into three sections—upper, middle, and lower—each with distinct roles and functions. While it is less common for the trapezius muscle to be injured compared to other muscles, strains and tears can occur, resulting in varying degrees of pain and loss of function. Given its extensive role in the body's movements, understanding the trapezius muscle is crucial.
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What You'll Learn
Trapezius muscle anatomy
The trapezius muscle is a large, triangular, paired muscle located on the posterior aspect of the neck and thorax. When viewed together, the two trapezius muscles form a diamond or trapezoid shape, hence their name. The trapezius muscles are two big muscles on either side of the upper back, starting at the base of the neck and extending across the shoulders and down to the middle of the back. They are the most superficial of the extrinsic muscles of the back and are part of the musculoskeletal system.
The trapezius muscle has several origin points along the midline of the posterior neck and back. The superior fibres attach to the medial third of the superior nuchal line, the external occipital protuberance of the occipital bone, and the nuchal ligament, which is attached to the spinous processes of the C1-C6 vertebrae. These fibres have a descending course towards their insertion point, hence this part of the trapezius is referred to as the descending part. The middle fibres originate from the spinous processes of T1-T4 vertebrae and their intervening supraspinous ligaments. These fibres are directed horizontally, running laterally towards the shoulder, and represent the transverse part of the trapezius. The inferior fibres originate from the spinous processes of the T4-T12 vertebrae and their respective supraspinous ligaments.
The trapezius muscle has many attachment points, extending from the skull and vertebral column to the shoulder girdle. The muscle is divided into three parts: descending (superior), ascending (inferior), and middle. The upper fibres can elevate and upwardly rotate the scapula and extend the neck. The middle fibres adduct (medially retract) the scapula. The lower fibres depress and aid the upper fibres in upwardly rotating the scapula. These motions allow for the scapula to rotate against the levator scapulae and the rhomboid muscles. This rotation, in conjunction with the deltoid muscle, is essential for throwing objects.
The trapezius muscle works in conjunction with several other muscles to produce coordinated movements, primarily involving the scapula. Some key muscle pairings include the rhomboids, levator scapulae, serratus anterior, deltoid, and pectoralis minor. 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 trapezius is also involved in the movements of the head and neck, such as turning the head to the side, elevating and depressing the shoulders, and internally rotating the arm.
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Trapezius muscle function
The trapezius muscle is a large, paired, triangular muscle located on the back of the neck and upper back. It is one of the most commonly affected muscles in facioscapulohumeral muscular dystrophy (FSHD). The trapezius muscle is divided into three sections—upper, middle, and lower—which have different roles.
The upper trapezius, or superior trapezius, begins at the base of the neck and extends across the tops of the shoulders. It helps with lifting the arms, turning and tilting the head, elevating the shoulder girdle, and extending, tilting, and rotating the neck. The upper trapezius is frequently involved in neck injuries, and its pain referral pattern often leads to cervicogenic headaches.
The middle trapezius spreads across the shoulders and helps keep them steady when the arms are moving. It also aids in bringing the shoulder blades back toward the spine, preventing excessive kyphotic (rounding of the upper back) posture.
The lower trapezius, or inferior trapezius, extends from the shoulder blades down the back, forming a trapezoid shape. This section keeps the spine stable during twisting or bending movements and helps lower the shoulders.
Overall, the trapezius muscle plays a crucial role in maintaining posture, moving the head, neck, and upper back, and supporting the spinal column. It is involved in various everyday movements, such as turning the head, shrugging the shoulders, and lifting the arms. The trapezius muscle works in conjunction with other muscles, including the rhomboids, levator scapulae, serratus anterior, and deltoid, to produce coordinated movements and maintain proper shoulder mechanics.
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Trapezius muscle pain
The trapezius muscle is a large, triangular, paired muscle located on the posterior aspect of the neck and thorax. Each person has two trapezius muscles, one on either side of the upper back, that help with movement of the head, neck, and upper back, and maintaining and adjusting posture. The trapezius muscle is susceptible to pain and injury due to its role in facilitating body movement and supporting the spinal column.
To alleviate trapezius muscle pain, individuals can try gentle exercises such as yoga or Pilates to improve flexibility and strengthen the muscles. Maintaining a healthy weight and warming up properly before exercising can also help prevent trapezius issues. In cases of severe pain, individuals may seek medical advice and be prescribed nonsteroidal anti-inflammatory drugs (NSAIDs), muscle relaxants, or pain relievers. Therapeutic interventions such as massage, stretching, and other manual therapies can also help alleviate trapezius muscle pain and tension.
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Trapezius muscle strain
The trapezius muscle is a large, triangular, paired muscle located on the posterior aspect of the neck and thorax. The muscle is divided into three sections: upper (superior), middle, and lower (inferior). The trapezius muscles help maintain posture and move the upper back, neck, and head. They also assist in downward rotation of the scapula and tilting the neck to the side when the scapula is fixed.
Given the trapezius muscle's role in supporting the spinal column and enabling movement in the upper back, neck, and head, any strain or injury to this muscle can significantly impact an individual's daily life. A trapezius muscle strain is a common injury that can limit the range of motion and strength in the arms. It occurs when the muscle fibres are stretched beyond their typical limit, either through acute injury or overuse.
Acute injuries are sudden and traumatic, often resulting from a fall, collision, or contact sports. Overuse injuries, on the other hand, develop gradually due to repetitive, low-impact activities performed over a prolonged period. This can include carrying a heavy bag for hours or even stress and anxiety, which can cause individuals to hunch their shoulders and hold tension, putting constant strain on the trapezius.
The symptoms of a trapezius strain vary depending on the severity of the injury. Mild strains may only cause tenderness in the muscle, while more severe strains can lead to swelling, bruising, and a loss of strength. In serious cases, a popping sensation and severe pain may be felt, indicating a complete tear or rupture of the muscle. Other symptoms include "knots" in the neck and upper back muscles, spasms, cramps, and stiffness in the neck and shoulders, limiting the range of motion and causing difficulty in turning the head.
If you suspect a trapezius strain, it is recommended to seek medical advice. A doctor will likely perform a physical examination and review your symptoms and medical history. In some cases, imaging tests such as X-rays or MRIs may be required to rule out fractures or other injuries. Treatment options depend on the grade of the injury, ranging from home remedies such as rest and ice to referrals to specialists for more severe cases.
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Trapezius muscle dysfunction
The trapezius muscle is a large, triangular, paired muscle located on the back of the neck and
Another factor contributing to trapezius muscle dysfunction is acute or chronic injury. Acute injuries occur suddenly due to trauma, such as a fall, collision, or weightlifting. On the other hand, chronic injuries develop over time through overuse or repetitive motions. Both types of injuries can cause muscle strain, tears, or spasms, leading to pain, swelling, and reduced mobility in the affected area.
Psychosocial factors, such as chronic stress and anxiety, can also impact the trapezius muscle. Individuals who experience these issues may unconsciously hunch their shoulders and hold tension in their shoulders and neck, putting constant strain on the trapezius muscle. This can lead to headaches, neck pain, and muscle tension.
Additionally, nerve damage or underlying medical conditions can contribute to trapezius muscle dysfunction. Nerve damage can cause pain, weakness, or paralysis in the affected area, impacting the normal functioning of the muscle. In some cases, trapezius myalgia may be a symptom of an existing underlying condition, which can cause persistent pain and stiffness in the upper trapezius muscle.
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Frequently asked questions
The trapezius muscle is a large, triangular, paired muscle located on the posterior aspect of the neck and thorax. It is one of the most commonly affected muscles in facioscapulohumeral muscular dystrophy (FSHD).
The trapezius muscle is involved in many movements of the shoulder girdle, which is the complex of bones that connect the arms to the rest of the body. It also helps with head and neck movements, maintaining and adjusting posture, and protecting the neck and spine.
A trapezius muscle strain can be caused by an acute injury, such as a hard fall or collision, or by overuse over a long period of time. Symptoms of a trapezius muscle strain can include pain, tenderness, swelling, bruising, and loss of muscle function. If you experience any of these symptoms, it is recommended to consult a healthcare provider.
