The trapezius is a broad, flat muscle that is triangular in shape. When combined with its contralateral side, it forms a trapezoid shape. It is an extrinsic muscle of the shoulder, meaning that it is located outside of the shoulder.
The muscle attaches to the skull, nuchal ligament and the spinous processes of C7-T12. It also attaches to the clavicle, acromion, and the scapula spine.
The trapezius muscle is responsible for abducting the upper limb at the shoulder, which is achieved by rotating the scapula. Furthermore, its upper fibres elevate the scapula, the middle fibres retract the scapula, and the lower fibres depress the scapula.
The motor innervation of the trapezius muscle is from the accessory nerve.
The trapezius muscle is supplied with blood from the transverse cervical artery.
The trapezius muscle also plays an important role in maintaining a good posture by keeping the shoulders back and the spine in its natural position. When the trapezius is weak, the shoulders may roll forward and the spine may become misaligned.
In addition, the trapezius also helps with activities in everyday life, such as carrying heavy objects or lifting weights. The muscle helps to stabilize the shoulder joints and protects them from injury during such activities.
The trapezius can also help with shoulder pain caused by poor posture or overuse of the joint. Strengthening the trapezius can help to support the shoulder and can help to alleviate pain caused by a weak or imbalanced muscle.
The trapezius muscle can be strengthened with the help of exercises such as shoulder shrugs, bent-over rows, upright rows, face pulls, and pull downs.
It is important to keep the movements controlled and to perform the exercises with correct form to ensure that the trapezius is being adequately activated. The trapezius can also be strengthened with the help of stretching exercises such as shoulder blade squeezes and neck rolls. It is important to maintain a regular stretching and strengthening routine to ensure that the muscle remains healthy and strong.
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