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Muscles: Serratus Posterior Inferior.

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Anatomy & Physiology: Muscles— Serratus Posterior Inferior.

Structure.

  • Origin: spinous processes and supraspinous ligaments of T11-L2.
  • Insertion: posterior aspect of ribs 9-12.

Function.

  • Concentric action: depress ribs 9-12.
  • Reverse mover action: contralateral rotation of T11-L2.
  • Eccentric action: controls/restrains/slows elevation of ribs 9-12; ipsilateral rotation of T12-L2.
  • Isometric action: stabilization of the lower ribs, and thoracolumbar spinal joints.
  • Innervation: subcostal and intercostal nerves.
  • Arterial supply: dorsal branches of posterior intercostal arteries.

Clinical Significance.

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.