What The Thoracolumbar Fascia Is: From a back view, the
thoracolumbar fascia makes a diamond shape. Because of its
shape, and its fairly central location on the back, the
thoracolumbar fascia is in a position to help unify the
movements of the upper body with that of the lower. Why the
Thoracolumbar Fascia Is Unique: The Three Layers of the
Thoracolumbar Fascia: Muscles and Their Relation to The
Thoracolumbar Fascia: Many back muscles attach to the
thoracolumbar fascia. For example, the erector spinae, a muscle
group also known as the paraspinals, run longitudinally down the
spine. The paraspinals are attached to the thoracolumbar fascia,
as well as to the bony spine. The lumbar part of the posterior
layer of the thoracolumbar fascia extends from the 12th (lowest)
rib down to the top of your hip bone (called the iliac crest).
Along the way, it connects with the internal oblique abdominal
muscle and the transverse abdominal muscle. Because of these
connections, the thoracolumbar fascia helps bridge the muscles