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Psoas muscles

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psoas muscles

A powerful flexor of the thigh at the hip joint (psoas major) and a weak flexor of the trunk and lumbar spinal column (psoas minor). Psoas is derived from the greek psoa, the plural meaning muscles of the loin. It is a common site of infection manifesting as abscess (psoas abscess). The psoas muscles and their fibres are also used frequently in experiments in muscle physiology.