Anatomy & Physiology: Muscles—Risorius.
Structure.
- Origin: fascia over parotid/salivary gland.
- Insertion: skin at angle of mouth.
- Superficial to buccinator and zygomaticus major-minor.
Function.
- Concentric action: draws angle of mouth laterally.
- Eccentric action:
- Isometric action:
- Innervation: facial VII nerve.
- Arterial supply: facial artery.
- “Risorius the grimacer”.
Clinical Significance.
More.
- http://anatomyzone.com/tutorials/musculoskeletal/muscles-of-facial-expression/
- https://www.anatomynext.com/risorius/
Risorius. 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.
