This information has been displayed with the kind permission of SportsInjuryClinic and Get Body Smart who can be found at the links below:
Oblique head: base of 2nd and 3rd metacarpals, trapezoid and capitate.
Transverse head: Palmar border and shaft of 3rd metacarpal
Insertion: Ulnar sesamoid then ulnar side of base of proximal phalanx and tendon of extensor pollicis longus.
Actions: Adducts CMC joint of thumb.
Innervation: T1 : Deep branch of ulnar nerve
Daily uses: Allows thumb to grip jar when opening lid.
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