Anatomy & Physiology: Muscles—Iliocostalis, of erector spinae group.
Structure.
- Iliocostalis Cervicis
- Origin: angles of ribs 3-6.
- Insertion: transverse processes of C4-C6.
- Iliocostalis Thoracis
- Origin: angles of ribs 7-12.
- Insertion: angles of ribs 1-6 and transverse process of C7.
- Iliocostalis Lumborum
- Origin: medial iliac crest and medial and lateral sacral crests.
- Insertion: angles of ribs 7-12.
Function.
- Concentric action: spinal extension, rotation and lateral flexion; maintain erect position.
- Reverse mover action: anterior tilt of pelvis at lumbosacral joint; extension of lower spine relative to upper spine; ipsilateral elevation of pelvis at LS and lateral flexion of lower spine; contralateral rotation of the pelvis at LS and lower spine contralateral rotation.
- Eccentric action: controls/restrains/slows spinal flexion, rotation, and lateral flexion of trunk and neck; also the posterior tilt and ipsilateral depression of pelvis.
- Isometric action: stabilization of the spine, ribs, and sacroiliac joint.
- Innervation: cervical and thoracic spinal nerves.
- Arterial supply: dorsal branches of posterior intercostal and lumbar arteries; thoracodorsal artery.
Clinical Significance.
References
Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.
Cedars-Sinai. (2018). Vertebrae of the spine. Retrieved from https://www.cedars-sinai.org/health-library/diseases-and-conditions/v/vertebrae-of-the-spine.html
Clark, M., Lucett, S., Sutton, B. G., & National Academy of Sports Medicine. (2014). NASM essentials of corrective exercise training. Burlington, MA: Jones & Bartlett Learning.
Jenkins, G., & Tortora, G. J. (2012). Anatomy and Physiology: From Science to Life, 3rd Edition International Stu. John Wiley & Sons.
Muscolino, J. E. (2017). The muscular system manual: The skeletal muscles of the human body.
