Anatomy & Physiology: Muscles—Psoas Minor.
Structure.
- Origin: bodies of T12 and L1 and intervening intervertebral disc.
- Insertion: fascia covering psoas major and iliacus.
Function.
- Concentric action: accelerates hip flexion and external/lateral rotation; extends and rotates lumbar spine.
- Reverse mover action: pelvis posterior tilt, lower trunk flexion, ipsilateral pelvic elevation.
- Eccentric action: controls/restrains/decelerates hip extension and internal rotation.
- Isometric action: stabilization of lumbo-pelvic hip complex.
- Innervation: spinal nerve branches of L2-L3.
- Arterial supply: lumbar arteries, arteria lumbalis ima of median sacral artery, lumbar part of iliolumbar artery, common iliac artery.
Clinical Significance.
Psoas minor. Used with permission by 3D4Medical.
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.
