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Sternocleidomastoid mm






Sternocleidomastoid: Origin and Insertion


Origin: Anterior and superior manubrium and superior medial third of clavicle.

Insertion:  Lateral aspect of mastoid process and anterior half of superior nuchal line

Innervation: Spinal accessory nerve (lateral roots C1-5)Actions: Flexes and laterally rotates cervical spine. When working b

protracts head . Extends neck when neck already partially extended.ilaterally

Daily uses: Looking over shoulder when reversing.


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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

More Anatomy

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Check out strengthening exercises for the rotator cuff




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