Trapezius Muscle
Where do the descending fibers of the trapezius INSERT?
Lateral third of the posterior clavicle
Where do the transverse fibers of the trapezius INSERT?
Medial acromion, superior spine of scapula
Where do the ascending fibers of the trapezius INSERT?
Medial spine of the scapula
Where do the descending fibers of the trapezius ORIGINATE?
Medial third of superior nuchal line on occipital bone, external occipital protuberance
What is the ACTION of the entire muscle?
Retracts scapula
What is the ACTION of the transverse fibers of the trapezius?
Retracts scapula
Innervation (trapezius)
Spinal accessory nerve CN XI and (C3, C4, C5 for sensory)
Where does the transverse/middle fibers of the trapezius ORIGINATE?
Spinous processes of C7 to T4
Where do the ascending/lower fibers of the trapezius ORIGINATE?
Spinous processes of T5-T11
What is the ACTION of the ascending fibers of the trapezius?
Depresses scapula
What is the ACTION of the descending fibers of the trapezius?
Elevates scapula