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Origin: Posterior crest of the ilium (via the Thoracolumbar fascia) Posterior sacrum. Spinous processes of T7-L5
Insertion: Intertubercular groove (between the greater and lesser tuberosities) of the humerus
Actions: Extension. Internal rotation. Adduction
Innervation: Thoracodorsal nerve .
Daily uses: Pushing on the arms of a chair when standing up
Other muscles of the Upper Limb
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
This information has been displayed with the kind permission of SportsInjuryClinic and Get Body Smart who can be found at the links below: