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Action of Erector spinae (3 columns) iliocostalis
Trunk extension, rotation, and lateral flexion of vertebral column
Insertion of Pectoralis major
Fibers converge to insert by a short tendon into lateral side of the intertubercular sulcus of the humerus
Action of Serratus anterior
Rotates scapula so that its inferior angle moves laterally and upward, scapular abduction (keeps scapula close to body)
Insertion of the Quadratus lumborum
Transverse processes of upper lumbar vertebrae and lower margin of 12 rib
Origin of Pectoralis major
Sternal end of clavicle, sternum, cartilage of ribs 1-6 and aponeurosis of external oblique;
Insertion of Trapezius II (Middle fibers)
Medial margin of acromion process, superior spine of scapula
Insertion of Trapezius III (Lower fibers)
Medial spine of scapula and tubercle at apex of spine and scapula
Insertion of Levator scapulae
Medial border of scapula, superior to the spine (superior angle of scapula)
Origin of Latissimus dorsi
Spinous processes T7-12, thoracolumbar fascia, iliac crest, and inferior 3 or 4 ribs
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