Filet Mignon AKA the Psoas

Several people have commented on the photo of the psoas muscle in our last newsletter. It is quite an impressive muscle, the thickest muscle in our bodies and the only muscle that connects our thighs to our trunk. It originates from the front of the lumbar and last thoracic vertebra (transverse process of T12-L5 and the lateral aspect of the disks) and attaches to the inside of the thigh (lesser tubercle of the femur). The psoas is joined at the hip, by the iliacus, which travels from hip to thigh. Together, the psoas and iliacus make up the iliopsoas, the body’s most powerful hip flexor. It is no wonder why connoisseurs call the cow’s psoas “filet mignon.”