| Term | Definition |
| post rami of spinal nn (segmental) | erector spinae/ IN |
| extends vertebral column, laterally flexes and rotates vertebral column to same side | erector spinae/ A |
| inf: iliac crest lat to PSIS; sup: rib angle of lower 6 ribs (7-12) | erector spinae, iliocostalis lumborum/ attachment |
| inf: rib angles of lower 6 ribs (7-12); sup: rib angles of upper 6 ribs (1-6) | erector spinae, iliocostalis thoracis/ attachment |
| inf: rib angles 1-3; sup: transverse process, post tubercles C2-C6 | erector spinae, iliocostalis cervicis/ attachment |