Deltoid

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

Deltoid Muscle

       

Deltoid- Origin/ Insertion

 

 Deltoid

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…

Infraspinatus

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.

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


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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