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. 2019 Feb 3;23(6):467–475. doi: 10.1016/j.bjpt.2019.01.011

Figure 1.

Figure 1

The 3 parts of the trapezius muscle. The posterior deltoid is also illustrated. Note that the red arrow shows the line of action of the upper trapezius muscle.

Reproduced with permission from Neumann DA, Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation, 3rd ed, Elsevier, 2017.