Scalenes

 This information has been displayed with the kind permission of  SportsInjuryClinic and Get Body Smart who can be found at the links below:

Scalenes Anterior mm

Scalenes Anterior: Origin and Insertion

(Anterior view, jaw removed)

Scalenus Anterior

Origin: Transverse processes of C3-6.

Insertion: Scalene tubercle on inner border of 1st rib

Actions: Raises first rib during inspiration. When working bilaterally flexes cervical spine. When working independently laterally flex and rotate neck.

Innervation: C5-7 Ventral rami.

Daily uses: Inspiration.

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Scalenes Medius mm

Scalenes Medius: Origin and Insertion

(Anterior view, jaw removed)

Scalenus Medius

Origin: Posterior tubercles of transverse processes of C2-7.

Insertion: Upper surface of first rib.

Actions: Raises first rib during inspiration. When working bilaterally flexes cervical spine. When working independently laterally flex and rotate neck.

Innervation: C3-8 (Ventral rami)

Daily uses: Inspiration.

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Scalenes Posterior mm

Scalenes Posterior: Origins and Insertion

(Anterior view, jaw removed)

Scalenus Posterior

Origin: Posterior tubercles of transverse processes of C5-7.

Insertion: Outer surface of second rib.

Actions: Raises second rib during inspiration. When working bilaterally flexes cervical spine. When working independently laterally flex and rotate neck.

Innervation: C7-8 (Ventral rami)

Daily uses: Inspiration.

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

More Anatomy

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Ligaments

Check out strengthening exercises for the rotator cuff

 

 

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