Muscle | Origin | Insertion | Innervation | Action |
---|---|---|---|---|
Iliocostalis cervicis | Ribs 3-7 | C4-C6 TP | Spinal nn. Posterior rami (lateral br.) C8 - L1 |
Bilateral: Extends spine Unilateral: Spine ipsilateral sidebend |
Iliocostalis lumborum | Sacrum Iliac crest Thoracolumbar fascia (posterior layer) |
Ribs 6-12 Upper lumbar TP Thoracolumbar fascia (posterior layer) |
Spinal nn. Posterior rami (lateral br.) C8 - L1 |
Bilateral: Extends spine Unilateral: Spine ipsilateral sidebend |
Iliocostalis thoracis | Ribs 7-12 | Ribs 1-6 | Spinal nn. Posterior rami (lateral br.) C8 - L1 |
Bilateral: Extends spine Unilateral: Spine ipsilateral sidebend |
Iliocostalis
Iliocostalis Cervicis
Origin
3rd-7th ribs4
Insertion
C4-C6 TP4
Innervation
Spinal nn. C8-L1 (Post rami, lateral branches)4
Action
Iliocostalis Thoracis
Origin
7-12th ribs4
Insertion
1st-6th ribs4
Innervation
Spinal nn. C8-L1 (Post rami, lateral branches)4
Action
Iliocostalis Lumborum
Origin
Sacrum, iliac crest, lumbar vertebrae SP; lower thoracic vertebrae TP4
Insertion
6-12th ribs, thoracolumbar fascia (posterior layer), upper lumbar vertebrae (TP)4
Innervation
Spinal nn. C8-L1 (Post rami, lateral branches)4
Action
Muscle groups
Iliocostalis is part of the Intermediate intrinsic back muscles (erector spinae)
Palpation
Clinical significance
1.
Betts JG, Blaker W. Anatomy and Physiology. 2nd ed. OpenStax; 2022. https://openstax.org/details/books/anatomy-and-physiology-2e/?Book%20details
2.
Donnelly JM, Simons DG, eds. Travell, Simons & Simons’ Myofascial Pain and Dysfunction: The Trigger Point Manual. Third edition. Wolters Kluwer Health; 2019.
3.
Neumann DA, Kelly ER, Kiefer CL, Martens K, Grosz CM. Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation. 3rd ed. Elsevier; 2017.
4.
Gilroy AM, MacPherson BR, Wikenheiser JC, Voll MM, Wesker K, Schünke M, eds. Atlas of Anatomy. 4th ed. Thieme; 2020.
Citation
For attribution, please cite this work as:
Yomogida N, Kerstein C. Iliocostalis. https://yomokerst.com/The
Archive/Anatomy/Skeletal Muscles/Muscles of the back/Erector
Spinae/Iliocostalis muscles/iliocostalis.html