Shoulder External Rotators:
Muscles Involved (3)
Infraspinatus
Teres Minor
Deltoids
O: Infraspinatus
Infraspinous fossa
A: Infraspinatus
Externally rotates the arm
O: Teres Minor
Upper 2/3 of lateral border of
scapula
I: Infraspinatus
Greater tuberosity of humerus
N: Infraspinatus
Suprascapular
I: Teres Minor
Greater tuberosity of humerus
N: Teres Minor
Axillary
A: Teres Minor
Externally rotates the arm
O: Deltoids
Lateral 3rd of clavicle,
acromion, spine of scapula
I: Deltoids
Middle and lateral surface of
humeral shaft
N: Deltoids
Axillary
A: Deltoids
Abducts arm; AF can flex and IR arm; PF can extend and ER