The trapezius muscle is a broad, thin triangular muscle. It lies superficially and consists of a cervical and a thoracic parts. The cervical part arises on the mid-dorsal raphe of the neck and the thoracic portion on the supraspinous ligament and the dorsal spinous processes, extending from the third cervical vertebral to the ninth thoracic vertebra. Both portions end on the spine of the scapula; the thoracic part unites with the thoracolumbar fascia and the cervical part with the omotransverse muscle.
Origin: Median fibrous raphe of the neck and the supraspinous ligament of the thorax. Its origin extends from the third cervical vertebra to the ninth thoracic vertebra.
Insertion: Spine of the scapula.
Action: Elevation of the limb and draws it forward. (protraction)
Nerve: Accessory nerve