The trapezius muscle is a triangular, flat muscle of the shoulder girdle.
Anatomy
The trapezius muscle is located in the neck and upper back and is divided into three distinct sections, each of which performs a different function.
Function
The trapezius muscle is essential for elevating the arms above the horizontal plane and stabilizing the shoulder when carrying heavy loads.
Clinical relevance
Paralysis of the trapezius muscle causes shoulder asymmetry and pain.