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


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