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