Observe the location and its attachments and shape , span. You can see here Psoas major and minor with iliacus at inner side of pelvic and back of Psoas is Quadratus lumborum muscle. Specifically, the psoas attaches to all five lumbar vertebrae and the twelfth thoracic vertebrae, it is at this area that diaphragm moves … Continue reading Everything to know and understand about “Psoas muscle” – for physical and mental health.