The transversospinales are a group of muscles of the human back.
Their combined action is rotation and extension of the vertebral column.
These muscles are small and have a poor mechanical advantage for contributing to motion.
They include: the three semispinalis muscles, the multifidus muscle, and the rotatores muscles.
The three semispinalis muscles, span 4-6 vertebral segments: The multifidus muscle, and spans 2-4 vertebral segments The rotatores muscles, lie beneath the multifidus, and spans 1-2 vertebral segments