The Trapezius

The trapezius is a major muscle of the back comprised of two large, wide, and flat superficial muscles that are responsible for moving, rotating, and stabilizing the scapula (shoulder blade) and extending the head at the neck.

Extending longitudinally from the occipital bone (a saucer-shaped membrane bone that is the main bone of the occiput and is situated at the back and lower part of the skull) to the lower thoracic vertebrae and laterally to the spine of the scapula, the functions of the trapezius are to move the scapulae and support the arm.