This information has been displayed with the kind permission of SportsInjuryClinic and Get Body Smart who can be found at the links below:
Insertion: Base of the first phalanx of the thumb.
Innervation: Deep radial nerve ( C6. C7)
Actions: Extends thumb and abducts wrist.
Daily uses: Opening hand to pick up jar.
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
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