Origin: External occipital protuberance, superior nuchal line of skull Nuchal ligament from spines of seventh cervical and all thoracic verebrae
Insertion: Lateral third of the Clavicle, acromion and spine of the Scapula
Function: Adducts scapula, tilts chin, draws back acromion, rotates scapula at the Scapulothoracic Joint
Nerve: Spinal Accessory Nerve
Artery: Descending scapular artery