Anatomy & Physiology: Muscles—Piriformis.
Structure.
- Origin: anterior surface of sacrum.
- Insertion: greater trochanter of femur.
- Of deep rotator group.
Function.
- Concentric action: accelerates abduction, and external/lateral rotation.
- Reverse mover action: contralateral and ipsilateral rotation of the pelvis.
- Eccentric action: decelerates hip flexion, adduction and internal rotation.
- Isometric action: stabilization hip and sacroiliac joints.
- Innervation: sacral spinal nerves S1 (mainly) and S2.
- Arterial supply: superior and inferior gluteal arteries.
Clinical Significance.
More.
- https://www.anatomynext.com/piriformis/
- https://www.youtube.com/watch?v=sJ_slDEUGdQ
- https://www.youtube.com/watch?v=Jmsf_N1PeTE
- https://www.youtube.com/watch?v=Yx1yOuPjVis
Piriformis. Used with permission by 3D4Medical.
References
Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.
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.
