- See:
Abductors of the Shoulder :
Origin: dorsal surface of inferior angle of the scapula on the lower 1/3 of scapular axillary border;
Insertion: medial lip of bicipital groove of humerus; medial to
latissimus dorsi
tendon;
Action: adducts and medially rotates humerus at the shoulder; extends the shoulder joint;
Reversed origin insertion action: when arm is fixed, adducts and elevates inferior angle of scapula;
Nerve supply: lower
subscapular,
C5,
C6,
C7;
Synergists: latissimus dorsi,
subscapularis;
* helps form
triangular space &
quadrangular space
