This information has been displayed with the kind permission of SportsInjuryClinic and Get Body Smart
Origin: Scaphoid tubercle & flexor retinaculum
Insertion: Radial sesamoid of proximal phalanx of thumb &extensor pollicis longus tendon.
Actions: Abducts thumb at MCP & carpometacarpal joints
Innervation: C8, T1 (median nerve).
Daily uses: Opening hand to grasp jar.
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: 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: 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