| The quadriceps, glutes, trapezius and upper back are also called into play. |
| Rhomboideus-occipitalis passes between trapezius and splenius to reach the occipital bone. |
| Scapular stability collectively involves the trapezius, serratus anterior and rhomboid muscles. |
| Arms too far back reduces stress on the posterior deltoids and involves the trapezius and back muscles. |
| The large trapezius muscle extends from the base of the skull to the last thoracic vertebrae, and from the spinal column to the scapulae. |
| In the shoulder girdle, the serratus anterior, upper and lower trapezius, levator scapulae and rhomboid muscles are involved. |
