Higher Trapezius Extend Your trapezius muscle is a considerable, dense muscle mass that starts within your neck, spans the width of one's shoulders, and extends by your mid-back along both sides of your respective spine. Verywell In shape's material is for informational and educational reasons only. Our Web page is https://www.theorthopaedicandpainpractice.com/understanding-neck-pain-and-effective-treatments/