The intertransversarii are small and short deep back muscles that stretch between the transverse processes of the adjacent vertebrae. Most of these muscles are located in the cervical (intertransversarii cervicis) and lumbar (intertransversarii lumborum) regions of the spine. However, small muscular slips are present in the lower thoracic region (intertransversarii thoracis). Together with the interspinales and levatores costarum, the intertransversarii form the deepest layer of the deep back muscles.