Spinous processes of T7–T12; Iliac crest of the pelvis; Thoracolumbar fascia; Ribs 9–12
Inferior angle of the scapula; Intertubecular groove of the humerus
Concentric Action: Shoulder extension, adduction, and internal rotation
Eccentric Action: Shoulder flexion, abduction, external rotation, and spinal flexion
Isometric Action: Stabilizes the lumbo–pelvic–hip complex and shoulder
Thoracodorsal nerve (C6–C8)
