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Trapezius (Middle Fibres)

Trapezius

Description

Origin :

  • Medial third of superior nuchal line; external occipital protruberance, nuchal ligament and spinous processes of C7 – T12 vertebrae.

Insertion :

  • Lateral third of clavicle, acromion and spine of scapula.

Innervation :

  • Spinal root of accessory nerve (CN XI) (motor) and cervical nerves (C3 and C4) (pain and proprioception).

Arterial Supply :

  • Transverse certical artery.

Depth :

  • Superficial

Action

Action :

  • Elevates scapula
  • Retracts scapula
  • Rotates scapula
  • Middle fibers retract scapula.
Target Muscles Target MusclesElevates, retracts and rotates scapula. Middle fibers retract scapula.