Serratus Posterior Superior/Inferior

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Serratus Posterior mm     Serratus Posterior: Origin and Insertion

Serratus Posterior Superior

Origin:  Ligamentum nuchae and spinous processes of C7 to T3.

Insertion:  The upper borders of the 2nd-5th ribs.

Actions: Aids inspiration by elevating ribs.


Daily uses: Inspiration/ breathing.

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Serratus Posterior Inferior mm    Serratus Posterior Inferior: origin and Insertion


   Serratus Posterior Inferior

Origin:  T11-L2 vertebral bodies.

Insertion:  Inferior borders of ribs 9-12.

Actions: Depresses the lower ribs aiding in expiration.

Innervation: Intercostal nerves.

Daily uses: Expiration

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Other muscles …


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


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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