LAUSR

BACKGROUND While many structures within the human body demonstrate anatomical variations, this is not typically the case for the iliopsoas muscle complex. However, the present paper describes a case of an anomalous psoas major composed of four different muscular heads in a 78-year-old male cadaver. MATERIALS AND METHODS During a routine dissection of the right posterior abdominal wall, an unusual psoas major was observed, measured and photographed. RESULTS The psoas major was found to possess four muscular heads, otherwise the anatomy of the wall was normal. CONCLUSIONS The presence of so many heads could interfere with the functions of the psoas major muscle. Therefore this anatomical variation merits further study.