Anatomy & Physiology: Muscles—Multifidus, of transversospinalis group.
Structure.
- Origin: posterior aspect of sacrum, ilium; transverse processes of L1-L5, T1-T12, and C1-C4.
- Insertion: spinous processes above the origin.
Function.
- Concentric action: neck and spinal extension, lateral flexion, and contralateral flexion.
- Reverse mover action: anterior til of pelvis, lower spine extension. Lesser: ipsilateral elevation of pelvis, lateral flexion of lower spine, ipsilateral rotation of pelvis.
- Eccentric action: controls/restrains/slows spinal flexion and rotation.
- Isometric action: stabilization of the spine.
- Innervation: corresponding cervical, thoracic, and lumbar spinal nerves.
- Arterial supply: dorsal branches of posterior intercostal and lumbar arteries.
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.
