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Back and "Spine"
Functional Anatomy: Muscle and Isolated Function
| Muscle | Isolated Function |
|---|---|
| Superficial Erector Spinae: Iliocostalis, Longissimus, and Spinalis | Concentrically accelerates spinal extension, rotation, and lateral flexion |
| Quadratus Lumborum | Spinal lateral flexion |
| Semispinalis: Thoracis, Cervicis, Capitis | Concentrically produces spinal extension and lateral flexion Concentrically produces extension and contralateral rotation of the head |
| Multifidus | Concentrically accelerates spinal extension and contralateral rotation |