Trapezius

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Original Author(s): Oliver Jones
Last updated: October 9, 2022
Revisions: 4

Original Author(s): Oliver Jones
Last updated: October 9, 2022
Revisions: 4

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The trapezius is an extrinsic muscle of the shoulder. It is a broad, flat and triangular shape – forming a trapezoid shape in combination with the contralateral side.

  • Attachments: Originates from the skull, nuchal ligament and the spinous processes of C7-T12. The fibres attach to the clavicle, acromion, and the scapula spine.
  • Actions: Abduction of the upper limb at the shoulder (by rotating the scapula). The upper fibres of trapezius also elevate the scapula, the middle fibres retract, and the lower fibres depress.
  • Innervation: Accessory nerve
  • Blood supply: Transverse cervical artery

Fig 1 – The superficial muscles of the back