The trapezius muscle is the large muscle between your neck and your shoulder. It forms the ‘V’ shape of your neck.
The trapezius muscles move the scapulae (shoulder blades), support the arms and help with core stability.
The trapezius has three functional regions: the superior region (descending part), which supports the weight of the arm; the intermediate region (transverse part), which retracts the scapula; and the inferior region (ascending part), which medially rotates and depresses the scapula.
Contraction of the trapezius muscle can have two effects: movement of the scapula when the spinal origins are stable, and movement of the spine when the scapulae are stable.
It is mainly used in throwing, along with the deltoid muscles.
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