Trapezius

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Trapezius mm

 Trapezius

Origin:  Medial superior nuchal line and external protuberance of the occipital line, ligamentum nuchae and spinous processes on C7- T12.

Insertion:  Lateral clavicle, acromion and spine of scapula.

Actions: 

Upper fibres: Elevate and upwardly rotate scapula.

Mid fibres: Retract scapula.

Lower Fibres: Depress scapula.

Innervation:  C3, C4 and accessory cranial nerve (XI).

Trapezius: Origin and InsertionDaily uses: Shrugging shoulders.

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Other muscles …

Supraspinatus

Origin: Supraspinous fossa

Insertion: Greater tuberosity of the humerus

Actions: Abduction 
Stabilisation of the humerus

Innervation: Suprascapular nerve

Daily uses: Holding shopping bags away from the body

 

Teres Minor

Origin: Mid section of the lateral border of the scapula

Insertion: Greater tuberosity on the humerus

Actions:External rotation, 
Shoulder adduction

Innervation: Axillary nerve

Daily uses: Brushing hair

Subscapularis

Origin: Anterior (costal) surface of the scapula

Insertion: Lesser tuberosity of the humerus

Actions: Internal rotation
, Adduction

Innervation: Upper and lower subscapular nerves

Daily uses: Tucking the back of your shirt into your trousers

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