This information has been displayed with the kind permission of SportsInjuryClinic and Get Body Smart who can be found at the links below:
Origin: Vertebral bodies of L1, 2 (left), L1-3 (right). Medial and lateral arcuate ligs, inner aspect of lower six ribs . Posterior aspect of xiphoid
Insertion: Central tendon
Actions: Assists in raising intra-abdominal pressure and inspiration.
Innervation: C3-5 Phrenic nerve (ventral rami)
Daily uses: Breathing
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