Anatomy & Physiology: Muscles—Subclavius.
Structure.
- Origin: first rib.
- Insertion: clavicle.
Function.
- Concentric action: depress and move clavicle anteriorly at sternoclavicular joint (SC); protraction of clavicle at SC, downward rotation of clavicle at SC joint; helps stabilize pectoral girdle.
- Reverse mover action: elevate first rib of sternocostal and costospinal joints.
- Eccentric action: controls/restrains/slows clavicular retraction, elevation, upward rotation, and controls/restrains/slows depression of first rib.
- Isometric action: stabilization of the scapula. Stabilization of clavicle and first rib.
- Innervation: subclavian nerve.
- Arterial supply: clavicular branch of thoracoacromial trunk (branch of axillary artery), suprascapular artery (branch of thyrocervical trunk).
Clinical Significance.
Subclavius. 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.
