The transversospinal muscles are a group of muscles of the human back. Their combined action is rotation and extension of the vertebral column. They include: semispinalis, spanning 4-6 vertebral segments semispinalis dorsi semispinalis cervicis semispinalis capitis multifidus, spanning 2-4 vertebral segments rotatores, spanning 1-2 vertebral segments rotatores cervicis rotatores thoracis rotatores lumborum [ http://en.wikipedia.org/wiki/Transversospinales_muscles ]