O:Spinous processes of T7-L5, posterior surface of sacrum, illiac crest, and lower three ribs
I:Medial lip of biciptal groove of humerus
A:Shoulder extension, add, IR, hyperextension
N:Thoracodorsal nerve(C6,C7,C8)
Teres Major
O:Axillary border of scapula near inferior angle
I:Crest below lesser tubercle next to the latissimus dorsi muscle attachment
A:Shoulder extension, adduction, and IR
N:Subscapular nerve (C5,C6)
Middle Deltoid
O:Acromion process
I:Deltoid tuberosity
A:Shoulder abduction
N:Axillary nerve (C5,C6)
Subscapularis
O:Subscapular fossa of scapula
I:Lesser tubercle of humerus
A:IR
N:Subscapular nerve(C5,C6)
Upper Trapezius
O:Occipital bone, nuchal ligament on cervial spinous processes
I:Outer third of clavicle, acromion process
A:Scapular elevation and upward rotation
N:Spinal accessory (cranial nerve XI)
Infraspinatus
O:Infraspinous fossa of scapula
I:Greater tubercle of humerus
A:Shoulder ER, horizontal abduction
N:Suprascapular nerve (C5,C6)
Lower Trapezius
O:Spinous processes of middle and lower thoracic vertebrae T4-T12
I:Base of the scapular spine
A:Scapular depression and upward rotation
N:Spinal accesory (cranial nerve XI)
Serratus Anterior
O:Lateral surface of the upper eight ribs
I:Vertebral border of the scapula, anterior surface
A:Scapular protraction and upward rotation
N:Long thoracic nerve (C5,C6,C7)
Coracobrachialis
O:Coracoid process of scapula
I:Medial surface of humerus near midpoint
A:Stabilizes shoulder joint
N:Musculocutaneous nerve (C6,C7)
Pectoralis Minor
O:Anterior surface of third through fifth ribs
I:Coracoid process of the scapula
A:Scapular depression, protraction, downward rotation, and tilt
N:Medial pectoral nerve (C8,T1)
