When the deep stabilizing muscles of the shoulder, such as the lower trapezius, serratus anterior and rotator cuff, aren’t firing properly, larger muscles such as the upper trapezius (located at ...

Mostly, the shoulder press works the anterior and lateral deltoids. Trapezius. The trapezius is a large muscle that starts at the base of your neck and ends in the middle of your back .

Fig. 1: Lateral and anterior views showing the patient's severe hypertrophy of the right trapezius muscle (left panel), wasting of the sternocleidomastoid muscles, and bilateral dystonia and ...

Results: Patterns of muscle activation were observed during the tennis serve motion. The serratus anterior (−287 ms before ball impact) and upper trapezius (−234 ms) were active in the early cocking ...

A trapezius strain can happen as the result of an acute injury or from long-term overuse. Learn what a trapezius strain feels like and how it's treated.