The iliopsoas muscle (pronounced with the "p" silent) is made of three muscles: the iliacus, psoas major and psoas minor. Together these muscles work to flex the hip, rotate the hip outward, bend the spine laterally, and stabilize the spine.
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There are three planes of motion that scientists use to describe movement of the joints of the body. The three planes are the saggital plane, horizontal or transverse plane and frontal plane. The frontal plane can be visualized by standing with your back to a wall.
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