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Multifidus Muscle: Anatomy 1. Location and Structure: • Sacral Region: The multifidus originates from the posterior surface of the sacrum, the posterior superior iliac spine (PSIS), the aponeurosis of the erector spinae, and the posterior sacroiliac ligament. • Lumbar Region: It attaches to the mammillary processes of the lumbar vertebrae. • Thoracic Region: It originates from the transverse processes of the thoracic vertebrae. • Cervical Region: In the cervical spine, it attaches to the articul