Anatomy & Physiology: Muscles—External Oblique.
Structure.
- Origin: external surface of ribs 5-12.
- Insertion: anterior iliac crest of pelvis, linea alba, and contralateral rectus.
Function.
- Concentric action: spinal flexion (especially lumbar region), lateral flexion, and contralateral rotation; compress abdomen.
- Reverse mover action: pelvic posterior tilt, lower trunk flexion, ipsilateral elevation of pelvis, lower trunk lateral flexion, ipsilateral rotation of pelvis.
- Eccentric action: controls/restrains/slows spinal extension, lateral flexion, and rotation.
- Isometric action: stabilization of lumbo-pelvic hip complex.
- Innervation: thoracic spinal nerves T7-T12; iliohypogastric L1.
- Arterial supply: subcostal and posterior intercostal arteries, deep circumflex iliac artery, inferior epigastric artery.
Clinical Significance.
More.
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.
