Human Anatomy: Muscle Groups

Human Anatomy

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Muscle Function & Other Pertinent Medical Information
- TRAPEZIUS -
ORIGIN:	Medial third superior nuchal line, ligament nuchae, spinous processes and supraspinous ligaments to T12
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
ACTION:	laterally rotates, elevates and retracts scapula. If scapula is fixed, extends and laterally flexes neck
NERVE:	Spinal accessory nerve (lateral roots, C1-5)(spinal nerves C3 and C4 for proprioception)

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