Iliocostalis (Lumborum, Thoracis, Cervicis)
- The iliocostalis lumborum, although sharing the common tendon, has its origin especially from the iliac crest and the sacrum. Its insertion is by a series of slips into the lower borders of the lower six or seven ribs.
- The iliocostalis thoracis consists of a number of fascicles that take origin from the upper borders of the lower six or seven ribs, medial to the insertions of the iliocostalis lumborum. The insertion is on the lower borders of the upper six ribs.
- The iliocostalis cervicis has its origin from the angles of the upper six ribs, medial to the insertions of the iliocostalis thoracis. Its insertion is on the transverse processes of about the fourth to sixth cervical vertebrae.