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Trapezius (Lower 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, retracts and rotates scapula

 

    • Lower (Inferior) fibers depress scapula

 

Target Muscles Target MusclesElevates, retracts and rotates scapula; Lower (Inferior) fibers depress scapula;