| Muscle Function & Other Pertinent Medical Information | | — TRAPEZIUS
— | | ORIGIN —
Medial third superior nuchal line, ligament nuchae, spinous processes and supraspinous ligaments to T12
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| INSERTION —
Upper fibers to lateral third of posterior border of clavicle; lower to medial acromion and superior lip of spine of scapula to deltoid tubercle
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| ACTION —
laterally rotates, elevates and retracts scapula. If scapula is fixed, extends and laterally flexes neck
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| NERVE —
Spinal accessory nerve (lateral roots, C1-5)(spinal nerves C3 and C4 for proprioception)
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