The trapezius muscle is a large, triangular, paired muscle located on the posterior aspect of the neck and thorax. When viewed together, this pair forms a diamond or trapezoid shape, hence its name. The trapezius has many attachment points, extending from the skull and vertebral column to the shoulder girdle. Origin: Descending part (superior fibres): medial third of the superior nuchal line, external occipital protuberance, nuchal ligament Transverse part (middle fibres): spinous processes and