Structure.
- Origin: transverse processes C3-C6.
- Insertion: Rib 1.
Function.
- Concentric action: right and left anterior scalene and middle scalene muscles flex head and elevate first ribs in deep inhalation; (acting together) head lateral flexion and contralateral rotation.
- Reverse mover action: elevate first rib.
- Eccentric action: controls/restrains/slows extension, contralateral lateral flexion, and ipsilateral rotation of neck, depression of first rib.
- Isometric action: stabilize neck and first rib.
- Innervation: C5-C6 spinal nerves.
- Arterial supply: ascending cervical artery.
Clinical Significance.
Anterior scalene. 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.
