trapezius muscles
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Trapezius: innervation
Spinal accessory (motor); proprioceptive afferent information via C3-4 spinal nerves
Trapezius: origin
Superior nuchal line, external occipital protuberance, nuchal ligament, spinous processes of C7-T12
Trapezius: vessels
superficial branch of transverse cervical artery
Trapezius actions
upper fiber-elevates Middle fibers-retracts lower fibers-depress scapula
Trapezius: insertion
Clavicle, Acromion, Spine