Erector Spinae Iliocostalis Lumborum Thoracis Cervicis Longissimus Thoracis Cervicis Capitis Spinalis Thoracis Cervicis Capitis Origin Sacrum Lower Posterior Surface [1 ] Transverse Processes [2 ] Ribs (Posterior) [1 ] Lumbar Vertebrae Transverse Processes [2 ] Thoracic Vertebrae Transverse Processes [2, 3 ] Cervical Vertebrae Transverse Processes [3 ] Ligamentum Nuchae [3 ] Insertion Ribs (Posterior) [1 ] Cervical Vertebrae Transverse Processes [1, 2 ] Spinous Processes [3 ] Thoracic Vertebrae Transverse Processes [2 ] Spinous Processes [3 ] Skull Mastoid Process [2 ] Occipital Bone [3 ] Action Spine (Lumbar, Thoracic) Extension [1, 2, 3 ] Lateral Flexion [1 ] Rotation [1] Spine (Cervical) Extension [1, 2, 3 ] Lateral Flexion [1, 2] Rotation [1, 2] Innervation Arterial Supply Relevant Approaches Relevant Conditions