Psoas major is one of the muscles of the posterior abdominal wall and anterior thigh. It arises from several sites:
It passes as a thick, fusiform muscle inferolaterally along the pelvic brim. Deep to the inguinal ligament it inserts into the medial surface of the lesser trochanter of the femur. Within the thigh it joins with the iliacus muscle to form the functional unit of the 'iliopsoas muscle'.
Psoas acts to:
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