Dictionary » T » Trapezius

Trapezius

trapezius

(Science: anatomy, muscle) origin, medial third of superior nuchal line, external occipital protuberance, ligamentum nuchae, spinous processes of seventh cervical and the thoracic vertebrae and corresponding supraspinous ligaments; insertion, lateral third of posterior surface of clavicle, anterior side of acromion, and upper and medial border of the spine of the scapula; action, when scapulae are fixed, portions of muscle can act independently: cervical portion elevates scapula, thoracic portion contributes to depression of scapula; upper and lowermost portions act simultaneously to rotate glenoid fossa superiorly; when the entire muscle and especially middle part contracts, the scapulae retract; draws head to one side or backward; nerve supply, motor by accessory, sensory by cervical plexus.

Synonym: musculus trapezius, cowl muscle, trapezius.


Please contribute to this project, if you have more information about this term feel free to edit this page



This page was last modified 21:16, 3 October 2005. This page has been accessed 1,963 times. 
What links here | Related changes | Permanent link