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Other Terms: Rotatores, Rotator muscle group, Musculi rotatores, Muscles rotateurs
The rotatores lie beneath the multifidus and are most prominent in the thoracic region. (The rotators of the lumbar region are called the deep intersegmental fibers of the multifidus by some authors.) Each muscle is small and somewhat quadrilateral in form; it arises from the upper and back part of the true transverse process of embryonic development, and is inserted into the lower border and lateral surface of the lamina of the vertebra above, the fibers extending as far as the root of the spinous process.