"spinous processes of T7-T12 vertebrae and thoracolumbar fascia"
"innervation: thoracodorsal nerve from the posterior cord (C6-C8 nerve roots) 3"
"The latissimus dorsi is a large muscle of the back with a very wide origin. Its fleshy fibres originate from the T7-T12 spinous processes. Blending with the thoracolumbar fascia below T12, the muscle origin becomes aponeurotic. It continues down the spinous processes and supraspinous ligaments of all lumbar and sacral vertebrae, as well as the posterior third of the iliac crest more laterally (and thus is the only muscle of the upper limb which also attaches to the pelvic girdle)."