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Deltoid Muscle


Deltoid- Origin/ Insertion



Origin:  Anterior portion: Anterior surface of the lateral clavicle. (red)

Middle portion: Acromion process and spine of scapula.(red)

Insertion: Deltoid tuberosity on the humerus (Blue)

Actions:  Anterior portion: Flexes and medial rotates the shoulder.

Middle portion: Abducts arm.

Innervation: Axillary nerve (C5-6)

Daily uses: Reaching up to top shelf. 


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Other muscles…


Origin: Posterior surface of the scapula (below the spine of the scapula)

Insertion: Greater tuberosity on the humerus

Actions: Shoulder abduction, 
External rotation.

Innervation: Suprascapular nerve

Daily uses: Brushing hair.


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


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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