The thoracolumbar fascia (lumbodorsal fascia or thoracodorsal fascia) is a complex, multilayer arrangement of fascial and aponeurotic layers forming a separation between the paraspinal muscles on one side, and the muscles of the posterior abdominal wall (quadratus lumborum, and psoas major) on the other. It spans the length of the back, extending between the neck superiorly and the sacrum inferiorly.
The thoracolumbar fascia (lumbodorsal fascia or thoracodorsal fascia) is a complex, multilayer arrangement of fascial and aponeurotic layers forming a separation between the paraspinal muscles on one side, and the muscles of the posterior abdominal wall (quadratus lumborum, and psoas major) on the other. It spans the length of the back, extending between the neck superiorly and the sacrum inferiorly.
Source: Wikipedia "Thoracolumbar fascia" · CC BY-SA 4.0
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